What is the number of molecules in
500m cube of Oxygen at room temperature

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%

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.

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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The half-life of the Uranium-235, given that the rock is composed of 25% Uranium-235 is 713 million years

First, we shall calculate the number of half lives that has elapsed. This can be obtained as follow:

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:

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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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.

Answer:

first blank: protons

second black: electrons

Explanation:

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.

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]

We can see that the solution has a boiling point of 80.93°C.

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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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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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

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?

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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Considering the definition of STP conditions, 4.83 × 10⁻³ moles of HF will occupy a volume of 0.108192 L at STP.

The 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.

In 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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Answer:

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:

Also, n is the mass divided by the molar mass of the gas:

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:

1) List the known and unknown quantities.

Amount of substance: moles

mass: grams

2) Set the equation.

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.

.

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

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.

The 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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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.

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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The stronger the acid the easier the H+ ions dissociate in solution of the following statements is true.

The correct option is A.

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.

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.

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.

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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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

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 stability of alkene can be determined by measuring the amount of energy that is associated with the hydrogenation of the molecule.

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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The energy from the sun heats up the water in the tank by convection and radiation.

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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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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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:

Hence, the percent yield for the reaction is 83.36%

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 %.

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.

Firstly we will determine the average or the mean of the objects density:

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:

We will determine the average of the deviation:

To determine the percent deviation we:

Answer: The percent deviation from the mean is 3.24%,

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:

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:

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):

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.