Explanation:
We have a gas sample of carbon dioxide and we know its volume, the pressure and the temperature. We can find the number of moles of that sample using the ideal gas law.
P * V = n * R * T
Where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas law and T is the temperature.
R = 0.082 atm*L/(mol*K)
Since R is in atm*L/(mol*K) we have to convert the volume from mL to L, the temperature from °C to K and the pressure from torr to atm.
1000 mL = 1 L
V = 26 mL = 26 mL * 1 L/(1000 mL)
V = 0.026 L
760 torr = 1 atm
P = 623 torr = 623 torr * 1 atm/(760 torr)
P = 0.820 atm
T = (273.15 + 11 ) K
T = 284.15 K
Now we can replace these values in the formula and solve it for n to find the number of moles that are present in the sample.
P * V = n * R * T
n = P * V/(R * T)
n = 0.820 atm * 0.026 L/(0.082 atm*L/(mol*K) * 284.15 K)
n = 0.000915 mol
Finally we can convert the moles of the sample into grams using the molar mass of carbon dioxide.
molar mass of C = 12.01 g/mol
molar mass of O = 16.00 g/mol
molar mass of CO₂ = 1 * 12.01 g/mol + 2 * 16.00 g/mol
molar mass of CO₂ = 44.01 g/mol
mass of CO₂ = 0.000915 mol * 44.01 g/mo
mass of CO₂ = 0.040 g
Answer: There are 0.040 g of carbon dioxide in the sample.
Which of the following set of quantum numbers are NOT possible? (You can pick more than one)
a. 1, 0, 0, +1/2
b. 4, 0, 0, +1/2
c. 3, 3, -3, -1/2
d. 2, 1, 1, -1/2
e. 2, 1, 2, +1/2
The set of quantum numbers (3, 3, -3, -1/2), and (2, 1, 2, +1/2) are not possible. Therefore, options c and e are correct.
What are the quantum numbers?The set of numbers that can describe the position and energy of the electron. We have four quantum numbers principal, azimuthal, magnetic, and spin quantum numbers.
Principal quantum numbers (n) tell about the principal electron shell of the atom and the most probable distance between the electrons and the nucleus. The azimuthal quantum number (l) tells about the shape of an orbital in which an electron is present. It has values equal to l = n - 1.
The magnetic quantum number tells about the total number of orbitals in a subshell and the orientation of these orbitals. The value of m lies in between -l to +l. The value of the spin quantum number describes the direction of spin of an electron and it has only two values +½ and -½.
In option c, the principle (n) and azimuthal (l) quantum number has the same value but when n = 3 the possible values of l are 2, 1, 0. In option d, the magnetic quantum number has the value of 2 while l has 1 which is not possible because when l= 1 the values of m can be +1, 0, and -1.
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Calculate the wavelength and energy of light that has a frequency of 1.1 * 10^17 Hz
The wavelength and the energy would be 2.72 × 10⁻⁹ meter 6.886 × 10⁻¹⁷ Joules and respectively if the light has s a frequency of 1.1 × 10¹⁷ Hz.
What is Wavelength?It can be understood in terms of the distance between any two similar successive points across any wave.
C = λν
As given in the problem we have to calculate the energy of the light if the frequency of light is 1.1 × 10¹⁷ Hz
The wavelength of the light = 3 × 10⁸ / 1.1 × 10¹⁷
= 2.72 × 10⁻⁹ meter
The energy of the light = h ν
= 6.26 × 10⁻³⁴ × 1.1 × 10¹⁷
= 6.886 × 10⁻¹⁷ Joules
Thus, the wavelength and the energy would be 2.72 × 10⁻⁹ meter 6.886 × 10⁻¹⁷ Joules and respectively if the light has s a frequency of 1.1 × 10¹⁷ Hz.
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What is the energy of a purple
lamp with a frequency of
7.5 x 10^14 Hz
Answer:
[tex] \huge{4.969 \times {10}^{ - 19} \:J }[/tex]
Explanation:
The energy of the purple lamp can be found by using the formula
E = hf
where
E is the energy
f is the frequency
h is the Planck's constant which is
6.626 × 10-³⁴ Js
From the question.
[tex] f = 7.5 \times 10^14 \: Hz [/tex]
We have.
[tex] E = 6.626 \times 10^{-34} \times 7.5 \times 10^{14} [/tex]
We have the final answer as
[tex]4.969 \times {10}^{ - 19} \: J[/tex]
Scientists discovered a rock formation in the mountains that
contains some amount of Uranium-235. Upon further testing you
learn that the rock is composed of 25% Uranium-235. Knowing that
the rock is 1.426 billion years old, how long is the half-life of
Uranium-235?
The half-life of the Uranium-235, given that the rock is composed of 25% Uranium-235 is 713 million years
How do i determine the half-life?First, we shall calculate the number of half lives that has elapsed. This can be obtained as follow:
Original amount of Uranium-235 (N₀) = 100%Amount remaining of Uranium-235 (N) = 25%Number of half-lives (n) =?2ⁿ = N₀ / N
2ⁿ = 100 / 25
2ⁿ = 4
2ⁿ = 2²
n = 2
Finally, we shall determine the half-life of the Uranium-235. This can be obtained as follow:
Number of half-lives (n) = 2 Age of rock (t) = 1.426 billion years Half-life (t½) = ?n = t / t½
Cross multiply
n × t½ = t
Divide both sides by n
t½ = t / n
t½ = 1.426 / 2
t½ = 713 million years
From the calculations made above, we can conclude that the half-life is 713 million years
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During a day that is 39°F outside, it is also mid-fall. There is a nearby pond, what assumptions can you make about the temperature within that pond on that day?
The temperature should be between 30 °F and 60 °F because the temperature outside is 39 °F, so the water in the pond should have a temperature range that includes this temperature.
Therefore, the answer is B.
Which of the following statements is true? *
The stronger the acid the easier the H+ ions dissociate in solution.
The weaker the acid the easier the H+ ions dissociate in solution.
The stronger the base the easier the H+ ions dissociate in solution.
O The weaker the base the easier the H+ ions dissociate in solution.
4 points
The stronger the acid the easier the H+ ions dissociate in solution of the following statements is true.
The correct option is A.
Does a stronger acid dissociate more?Because it almost entirely dissociates, HCl is a powerful acid. A weak acid, such as acetic acid (CH₃COOH), on the other hand, does not dissociate easily in water because numerous H+ ions are still locked up inside the molecule. In conclusion, more free H+ ions are liberated into solution with stronger acids.
Why do more stronger acids than weak acids dissociate?Strong acids (and bases) are completely dissociated into ions, which is the cause of this. In comparison to weak acids (and bases) of comparable concentrations, they therefore supply more ions for conductivity. An illustration is the complete ionization of a 0.1 M hydrochloric acid solution.
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The complete question is -
Which of the following statements is true?
A-The stronger the acid the easier the H+ ions dissociate in solution.
B-The weaker the acid the easier the H+ ions dissociate in solution.
C-The stronger the base the easier the H+ ions dissociate in solution.
D-The weaker the base the easier the H+ ions dissociate in solution.
How is percent composition related to alkene stability?
The stability of alkene can be determined by measuring the amount of energy that is associated with the hydrogenation of the molecule.
What is alkene stability?Because those branched alkanes are more stable than their linear isomers (Figure 1), the origins of this stability are unclear. For each branch in an alkane, the measured heat of formation is lower than expected by about 2 kcal mol−1 in comparison to the linear isomer. The fullness structures in which all atoms have complete valence shells are more stable. The structures with the least number of ritual charges are more stable. The structures with a negative charge on the further electronegative atom will be more stable. The three main factors determining the relative stability of alkenes are i) the number of substituents attached to the double-bond carbon atoms, ii) hyperconjugation, and iii) the stereochemistry of the double bond.
So we can conclude that the more electron-donating alkyl groups are the more stable the alkene
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Can someone draw this for me?
Btw you don't need real gumdrops or toothpicks you just need to draw it.
I'll mark the brainliest.
Both calcium oxide and carbon dioxide are inorganic compounds where calcium oxide is an ionic compound with a positive end at calcium and negative end at oxygen and carbon dioxide is a covalent compound formed by two double bonds between carbon and each oxygen.
What is calcium oxide?Calcium oxide is also called soda lime which is an inorganic compound formed by the ionic bonding of oxygen and calcium. Calcium is a metal and it is electron rich with 2 valence electrons.
Oxygen is electronegative gas, having 6 valence electrons and require two electrons to be stable. Thus calcium donates its two electrons to oxygen making calcium a positive ions and oxygen a negative ion.
In carbon dioxide, carbon have a valency of four thus, it forms 4 bonds with two oxygens. Double bonds are formed with each oxygen as shown in the image. These bonds are formed by electron sharing and is called covalent.
Calcium carbonate is formed by passing carbon dioxide through lime (CaO) in which Ca exists as Ca²⁺ ion and carbonate as an anion with three negative charges residing on 2 oxygens in CO₃.
Therefore, the structure of each of these compounds depends on the type of bonds between the atoms and it is depicted in the uploaded image.
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For the following equations you will be given the names of reactants and products. In the space below each reaction provide theformulas of each reactant and product along with coefficients.
Explanation:
First, let's write the formulas:
Potassium chlorate: KClO3
Oxygen: O2
Potassium chloride: KCl
So the reaction will be:
KClO3 -> O2 + KCl
Now let's balance it.
To balance the equation it is necessary to have the same number of atoms of each element on both sides of the equation (reactant side and product side). Let's count the number of atoms of each element for the unbalanced equation: KClO3 -> O2 + KCl
Reactant side:
K - 1
Cl - 1
O - 3
Product side:
O - 2
K - 1
Cl - 1
As you can see, oxygen number of atoms is not equal on both sides of the equation. Let's balance it by changing the stoichiometric coefficient.
2KClO3 → 2KCl + 3O2
Let's count the number of atoms of each element for the balanced equation.
Reactant side:
K - 2
Cl - 2
O - 6
Product side:
K - 2
Cl - 2
O - 6
Now the equation is balanced.
Answer: 2KClO3 → 2KCl + 3O2
Coefficients are: 2, 2 and 3.
you find the density of an object 4 times 1.3g/ml 1.25g/ml 1.17g/ml and 1.22g/ml now determine the percent deviation from the mean
Firstly we will determine the average or the mean of the objects density:
[tex]\begin{gathered} Mean=\frac{1.3g•mL^{-1}+1.25g•mL^{-1}+1.17g•mL^{-1}+1.22g•mL^{-1}}{4} \\ Mean=\frac{4.94g•mL^{-1}}{4} \\ Mean=1.235 \end{gathered}[/tex]Now we will calculate the deviation. The deviation is how much is trial is different from the average. We take the absolute value so the answers can be positive:
[tex]\begin{gathered} Trial\text{ }1:|1.3-1.235|=0.065 \\ Trial\text{ }2:|1.25-1.235|=0.015 \\ Trial\text{ }3:|1.17-1.235|=0.065 \\ Trial\text{ }4:|1.22-1.235|=0.015 \end{gathered}[/tex]We will determine the average of the deviation:
[tex]\begin{gathered} Deviation\text{ }mean=\frac{0.065+0.015+0.065+0.015}{4} \\ Deviation\text{ }mean=0.04 \end{gathered}[/tex]To determine the percent deviation we:
[tex]\begin{gathered} \%\text{ }deviation=\frac{mean\text{ }deviation}{mean}\times100 \\ \\ \%\text{ }deviation=\frac{0.04}{1.235}\times100 \\ \\ \%\text{ }deviation=3.24\% \end{gathered}[/tex]Answer: The percent deviation from the mean is 3.24%,
A solution is made by dissolving4.87 g of potassium nitrate in waterto a final volume of 86.4 mL solution.What is the weight/weight % orpercent by mass of the solute?Use 1.00 g/mL for the density of the solution.Enter text here
Answer
The weight/weight % of solute = 5.3%
Explanation
Given
Mass of solute (potassium nitrate) = 4.87 g
Volume of solvent (water) = 86.4 mL
Density of water = 1.00 g/mL
Required: Weight/weight% of the solute
Solution
Step 1: Covert the volume of water to mass
mass = density x volume
mass = 1.00 g/mL x 86.4 mL
mass = 86.4 g
Step 2: Calculate the weight/weight % of the solute
Mass % solute = [mass of solute/(mass of solute + mass of solvent)] x 100
Mass % solute = 4.87g/(4.87 + 86.4)
Mass % solute = 5.3%
In Peft A, we saw that the theoretical yield of aluminum oxide is 1.50 mol. Calculate the percent yield if the actual yield ofaluminum oxide is 0.885 mol .Express your answer with the appropriate units.D View Available Hint(s)
Explanation:
The theoretical yield of our reaction is 1.50 moles, the actual yield of aluminum oxide is 0.885 moles. The percent yield is:
percent yield = actual yield/theoretical yield * 100 %
percent yield = 0.885 moles/(1.50 moles) * 100 %
percent yield = 59.0 %
Answer: The percent yield is 59.0 %.
Jade throws a horseshoe toward a stake from the same starting point three different times. She tries to throw the horseshoe with the same amount of force each time. Jade measures the distance each horseshoe lands from the stake. Which distances did Jade likely measure?
Responses
100 in., 200 in., 300 in.
5 in., 25 in., 50 in.
2 in., 100 in., 120 in.
11 in., 12 in., 13 in
Since Jade tried to throw the horseshoe with the same amount of force, the likely distances that Jade measured would be 11 in., 12 in., 13 in. The last option.
Force and distanceThe distance that the horseshoe thrown by Jade travels is a measure of the amount of force that she applies. The more the force, the longer the distance.
However, Jade tried to ensure that the same amount of force is used the 3 times she threw the horseshoe. The consequence is that the distance of the horseshoe from the stake will not vary much in all the 3 throws.
If the distances vary significantly, it means the amount of force used by Jade also differs significantly.
Thus, the only distances that could be a reflection of the relatively constant force used by Jade to throw the horseshoe are 11 in., 12 in., 13 in.
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Using the Mole: Empirical Formulas, Molecular Formulas, % Composition5. Potassium persulfate was used in photography to remove the last traces of hypo from photographic papers and plates, A 0,8162 g sample was found to contain 0,2361 g of potassium, 0.1936 g of sulfur, and the rest was oxygen. The formula weight of this compound was measured to be 270. What are the empirical and molecular formulas of this compound?
Answer:
Molecular formula = KSO4.
Empirical formula = K2S2O4.
Explanation:
What is given?
Mass of K (potassium) = 0.2361 g.
Mass of S (sulfur) = 0.1936 g.
Mass of O (oxygen) = 0.8162 g - 0.2361 g - 0.1936 g = 0.3865 g.
Molar mass of K = 39.1 g/mol.
Molar mass of S = 32 g/mol.
Molar mass of O = 16 g/mol.
Weight of compound = 270 g/mol.
Step-by-step solution:
Remember that empirical formulas show the simplest whole-number ratio of atoms in a compound, and molecular formulas show the number of each type of atom in a molecule. So first, let's see what would be the molecular formula:
Let's find the number of moles of each element using its molar mass:
[tex]\begin{gathered} 0.2361\text{ g K}\cdot\frac{1\text{ mol K}}{39.1\text{ g K}}=0.006038\text{ moles K,} \\ 0.1936\text{ g S}\cdot\frac{1\text{ mol S}}{32\text{g S}}=0.006050\text{ moles S,} \\ 0.3865\text{ g O}\cdot\frac{1\text{ mol O}}{16\text{ g O}}=0.02416\text{ moles O.} \end{gathered}[/tex]The next step is to divide each number of moles obtained by the least number of moles, in this case, the least number is 0.006038:
[tex]\begin{gathered} 0.006038\text{ moles K/0.006038=1 mol K,} \\ 0.006050\text{ moles S/0.006038 =}1.001\text{ moles S}\approx1\text{ mol S,} \\ 0.02416\text{ moles O/0.006038=4.001 moles O}\approx\text{4 moles O.} \end{gathered}[/tex]Our molecular formula would contain 1 mol of K, 1 mol of S, and 4 moles of O, so it would be KSO4.
But remember that we need to find the empirical formula too, based on the molecular weight. In the statement, they're telling us that the molecular weight is 270 g/mol, but the molecular weight of KSO4 is 135 g/mol (you can calculate it using the given molar masses and by doing an algebraic sum). So, to obtain the empirical formula with 270 g/mol as molecular weight, we have to multiply by two each number of moles of the compound (135 g/mol * 2 = 270 g/mol):
[tex]\begin{gathered} 1\text{ mol K}\cdot2=2\text{ moles K,} \\ 1\text{ mol S}\cdot2=2\text{ moles S,} \\ 4\text{ moles O }\cdot2=8\text{ moles O.} \end{gathered}[/tex]So, you can realize that K2S2O4 would be the empirical formula because its molecular weight would be 270 g/mol.
Molecular formula = KSO4.
Empirical formula = K2S2O4.
the atomic number of an atom is the number of _____ in its nucleus and is equal to the number of ____ if the atom is not charged
Answer:
first blank: protons
second black: electrons
Explanation:
Please help
For this assignment, you will create a public service
announcement, or a PSA, describing the environmental
and economical impact of the end-products of
chemical reactions of those that may result in the
greenhouse effect or ozone depletion.
Items you must include or address:
• describe the chemical reaction
occurring using a
chemical equation and identifying the reactants
and products.
• demonstrate how mass/matter is conserved
during this chemical reaction.
• describe the energy changes that accompany this
chemical reaction.
• describe how the end-products affect the
environment.
• describe the economical impact.
provide ways for anyone to help reduce the
environmental impacts.
I need to be a letter to your senator
The assignment about the Public Service Announcement (PSA) describing the environmental impacts due to ozone depletion and the greenhouse effect is given below.
Since we live in a modern industrialized world, we need to get exposed to lots of chemicals and pollutants. With modernization people began to use Air conditioners, Refrigerants, and other household appliances for a sophisticated lifestyle without knowing the harmful effects it causes on the environment.
The use of Refrigerators and Air Conditioners contains Freons which are used as aerosol propellants. These freons release CFCs which are called as Chloro-Fluro-Carbons which are the main element responsible for damaging the environment by causing both global warming and Ozone depletion.
The Chlorine atom that is released from the CFCs breaks the bond of the Ozone. The reaction is elucidated below:
ClO + O -------> Cl + O₂
This breaks the bond of Ozone creating Ozone depletion and eventually leading to Global Warming.
Similar to Ozone depletion, another main environmental problem is the greenhouse effect which is occurring mainly due to the release of harmful gases from automobiles, and industries such as CO₂, SO₂, etc... These gases absorb and trap the solar heat from the Infrared region and creates a greenhouse effect. These gases are called greenhouse gases.
This greenhouse effect, ozone depletion eventually leads to an increase in global temperature and results in the rising of sea levels by melting the glaciers and icebergs. The climatic pattern is adversely affected. This would affect agriculture, as well as the health of humans as harmful UV rays that enter the earth due to ozone depletion, will lead to skin diseases, cancer, and so on.
By adversely affecting the agriculture and health of the world, there would be a drop in the entire economy as our country is dependent mainly on agriculture for the nation's economy.
The effects of these could be minimized by using public transport, planting trees, using refrigerators and air conditioners free from freons, and proper treatment of the wastes eliminated from industries must be ensured.
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A 0.15M solution of methylamine CH3NH2 contains an unknown concentration of methylamine chloride CH3NH3Cl. If the solution has a pH of 10.20,what is the concentration of methylamine chloride in the solution? Kb for methylamine =4.6*10^-4
The concentration of methylamine chloride in the solution is 0.44 M.
given that :
concentration of methylamine , [ base ] = 0.15 M
pH = 10.20
pH + pOH = 14
pOH = 14 - pH = 14 - 10.20 = 3.8
Kb = 4.6 × 10⁻⁴
concentration of methylamine chloride , [ acid ] = ?
The equation of POH is given by the following formula :
POH = pKb + log [ acid ] / [ base ]
pkb = -log kb
pkb = - log ( 4.6 × 10⁻⁴ )
pkb = 3.33
now, substituting the values, we get:
POH = pKb + log [ acid ] / [ base ]
3.8 = 3.33 + log [ acid ] / [ 0.15 ]
0.47 = log [ acid ] / [ 0.15 ]
10^0.47 = [ acid ] / [ 0.15 ]
2.95 = [ acid ] / [ 0.15 ]
[ acid ] = 0.44 M
Thus, A 0.15M solution of methylamine CH3NH2 contains an unknown concentration of methylamine chloride CH3NH3Cl. If the solution has a pH of 10.20,what is the concentration of methylamine chloride in the solution is 0.44 M.
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What is the electronic configuration of argon
Electronic configuration: this shows us the distribution of electrons in an atom. The chart below helps us find the electron configuration.
How many protons does argon have?
Argon has 18 protons.
The electronc configuration of argon is 1s2 2s2 2p6 3s2 3p6
determine the number of significant figures in each of the following numbers.1.) 32.05 =2.) 36541 =3.) 300,012,345 =4.) 36,000 =5.) 100 =6.) 100.0 =7.) 1,0000 =8.)250 =9.) 250. =10.) 407 =
we are required to determine the significant figures in each of the numbers.
1) 4 significant figures
2) 5 significant figures
3) 9 significant figures
4) 5 significant figures
5) 3 significant figures
6) 4 significant figures
7) 5 significant figures
8) 3 significant figures
9) 3 significant figures
10) 3 significant figures
6. Initially, a sample of nitrogen gas is found in a pressure of 4.62 atm under the temperature of 27.0℃. Find the change in temperature of the gas when the pressure is increased to 5.59 atm.
Answer: ΔT = 62.98
Explanation:
This can be done using Gay Lusac's Law which states that Pressure is proportional to temperature
So, we take p1 = 4.62 atm, t1 = (27+273)°K, p2 = 5.59 atm, t2=?
now, P1/T1 = P2/T2
From here find out T2 which would be in Kelvin and then subtract 273 to convert it into celsius. Then find the difference between T1 and T2 and you should have your answer.
Which temperature is unattainable?
a)_1k
b)_1°C
c)_1°F
d)All of these
Answer:
A is the correct answer.
Explanation:
It is possible to reach 1°C and 1°F because they are both units of temperature. But 1k is not a unit of temperature.
The volume of a gas is 200 mL at 330.0 kPa what will the volume be when the pressure is reduced to 45.0 kPa assuming the temperature remains constant
Answer
V2 = 1466.7 mL
Explanation
Given:
Volume 1 = 200 mL
Pressure 1 = 330.0 kPa
Pressure 2 = 45.0 kPa
Required: Volume 2
Solution:
To solve this problem we will use Boyles law
P1V1 = P2V2
V2 = P1V1/P2
V2 = (330.0 kPa x 200 mL)/45.0 kPa
V2 = 1466.7 mL
A reaction between liquid reactants takes place at 28.0 degree celcuis in a sealed, evacuated vessel with a measured volume of 15.0L. Measurements show that the reaction produced 10.0g of dinitrogen difluoride gas.
Calculate the pressure of dinitrogen difluoride gas in the reaction vessel after the reaction. You may ignore the volume of the liquid reactants. Round your answer to 2 significant digits.
The pressure of N2F2 will be 1.64 atm.
Given data:
Mass of N2F2 = 66 grams
Molar mass of N2F2 = 66 g/mol
Temperature = 28°C = 273 +28 = 301 Kelvin
volume = 15 L.
Gas constant = 0.08206 L*atm/K* mol
Number of moles can be determined by using the formula:
Number of moles = mass of N2F2 / Molar mass of N2F2
Number of moles = 66 g/ 66 g/mol = 1 moles.
Volume can be determined by using the formula:
P*V = n×R×T
where, P is pressure, V is volume, T is temperature.
P = (n×R×T)/ V
P = 1 * 0.08206 * 301 )/15 = 1.6466 atm.
The pressure of the sulfur tetrafluoride gas is 1.64 atm.
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- current answer: When solid potassium chlorate is heated in the laboratory it decomposes to form potassium chloride and oxygen. Consider this reaction to answer the questions below: When properly balanced the sum of the coefficients for this reaction = - 7 -. When you decompose 71.7 grams of potassium chlorate you can form a maximum of - blank2 -grams of potassium chloride and - blank3 -grams of oxygen.
When solid potassium chlorate is heated in the laboratory it decomposes to form potassium chloride and oxygen.
Consider this reaction to answer the questions below:
When properly balanced the sum of the coefficients for this reaction =
blank1 - Word Answer
7
.
When you decompose 71.7 grams of potassium chlorate you can form a maximum of
blank2 - Word Answer
Please type your answer to submit
grams of potassium chloride and
blank3 - Word Answer
grams of oxygen.
There is 1 error to address before submitting
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Answer:
The correct answer is option C. Slavery is a degrading institution to all those involved. Explanation: As Douglass narrates, slavery not only degrades slaves, but slavers asWhich of the following sentences best describes Douglass’s opinion about slavery?
A sample of gas with a mass of 1.45 g occupies a volume of 931 mL at a pressure of 733 Torr and a temperature of 16.0 ∘C . What is the molar mass of the gas?
Answer:
[tex]38.5\text{ g/mol}[/tex]Explanation:
Here, we want to get the molar mass of the gas
Let us call it M
From the ideal gas equation, we can get the number of moles of the gas
Mathematically:
[tex]\begin{gathered} PV\text{ = nRT} \\ n\text{ = }\frac{PV}{RT} \end{gathered}[/tex]Also, n is the mass divided by the molar mass of the gas:
[tex]\begin{gathered} \frac{m}{M}\text{ = }\frac{PV}{RT} \\ \\ M\text{ = }\frac{mRT}{PV} \end{gathered}[/tex]Where:
M is the molar mass that we want to calculate
m is the mass of the gas sample which is 1.45 g
P is the gas pressure which is 733 torr (to convert to atm, we multiply by 0.00131579 : 733 * 0.00131579 = 0.96 atm)
V is the volume which is 931 mL (We convert to L by dividing by 1000:
931/1000 = 0.931 L)
R is the molar gas constant which is 0.0821 L.atm/mol.K
T is the temperature that we convert to K by adding 273 K : 273 + 16 = 289 K)
Substituting the values, we have it that:
[tex]M\text{ = }\frac{1.45\text{ }\times0.0821\text{ }\times289}{0.96\times0.931}\text{ = 38.5 g/mol}[/tex]A reaction experimentally yields 15.68 g of a product. What is the percent yield if the theoretical yield is 18.81 g?
Answer
The percent yield = 83.36%
Explanation
Given:
Experimental yield = actual yield = 15.68 g
Theoretical yield = 18.81 g
What to find:
The percent yield for the reaction.
Step-by-step solution:
The percent yield for the reaction can be calculated using the formula below:
[tex]\begin{gathered} Percent\text{ }yield=\frac{Actual\text{ }yield}{Theoretical\text{ }yield}\times100\% \\ \\ Percent\text{ }yield=\frac{15.68\text{ }g}{18.81\text{ }g}\times100\% \\ \\ Percent\text{ }yield=83.36\% \end{gathered}[/tex]Hence, the percent yield for the reaction is 83.36%
How do you calculate mass of a known substance (sodium chloride for example) given its amount in terms of moles? O multiply moles by the molar mass O divide moles by the molar mass O cannot be determined based on the given divide the molar mass by the Avogadro's number
1) List the known and unknown quantities.
Amount of substance: moles
mass: grams
2) Set the equation.
[tex]Molar\text{ }Mass=\frac{Mass\text{ }(grams)}{Amount\text{ }of\text{ }substance\text{ }(moles)}[/tex][tex]Molar\text{ }Mass\ast Amount\text{ }of\text{ }substance\text{ }(moles)=Mass\text{ }(grams)[/tex]If we have the number of moles of a compound, we have to multiply it by the molar mass to find the mass.
Answer: multiply moles by the molar mass.
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Calculate the boiling point of a 0.33 m solution of a solute in benzene.
(Kb = 2.53°C /m).
We can see that the solution has a boiling point of 80.93°C.
What is the boiling point?The atmospheric pressure does equal the pressure of a liquid as we heat the system. The temperature at which this occurs is called the boiling point. Now we know that the boiling point of the pure benzene is 80.1 °C.
Given that;
ΔT = K m i
ΔT = boiling point elevation
K = boiling point constant
m = molality of the solution
i = Van Hoff factor (molecular solute)
ΔT = 2.53°C /m * 0.33 m * 1
ΔT = 0.83°C
The boiling point of the solution is now gotten from ; 0.83°C + 80.1 °C
= 80.93°C
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In paragraph format explain how the energy from Sun gets heats the water in tank. The explanation is based on the concept of atoms (or particles) of matter and the heat transfer (conduction, convection and radiation)
The energy from the sun heats up the water in the tank by convection and radiation.
What is heat transfer?We know that heat is that which is able to effect a temperature change in an object. Now, we know that there are three forms of heat transfer and these are;
1) Conduction
2) Convection
3) Radiation
Now, we know that radiation is the movement of heat without a medium of propagation. Heat from the sun reaches the tank by radiation. The molecules that are at the surface are first heated up and sink down while the heavier particles below move up. This is called convection.
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Express the following in liters at STP:
4.83 x 10^-3 moles HF
Considering the definition of STP conditions, 4.83 × 10⁻³ moles of HF will occupy a volume of 0.108192 L at STP.
STP conditionsThe STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases, and 1 mole of any gas occupies an approximate volume of 22.4 liters.
Volume in this caseIn this case, you have 4.83×10⁻³ moles of HF. You can apply the following rule of three: if by definition of STP conditions 1 mole of HF occupies a volume of 22.4 liters, 4.83×10⁻³ moles occupies how much volume?
volume= (4.83×10⁻³ moles ×22.4 L)÷ 1 mole
volume= 0.108192 L
Finally, there is a volume of 0.108192 L at STP.
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