To calculate the number of atoms of any compound it is necessary to use the Avogadro constant. This is a constant of proportion between the amount of matter and the number of entities that are linked to that amount. These entities can be atoms, molecules, ions, electrons, protons, neutrons. The value of the Avogrado constant is 6.022 x 10^23 mol^-1.
So to calculate the number of atoms in 275 grams of iron (III) hydroxide:
- First you need to transform grams into moles
- transform moles into atoms/molecule using Avogrado constant.
- To transform 275 grams of Fe(OH)₃ you need to use the molecular mass of Fe(OH)₃ and the following equation: mole = mass/molar mass
Molecular mass of Fe(OH)₃:
Fe - 55.85
O - 16
H - 1
(1x55.85) + (3x16) + (3x1) = 106.86 g/mol
Replace the value in the equation:
mole = 250/106.86
mole = 2.34 mole of Fe(OH)₃
- Now, let's solve the number of molecules of Fe(OH)₃ into 2.34 mole of Fe(OH)₃:
6.022 x 10^23 molecule --- 1 mol
x molecule ---- 2.34 mole
x = 1.41 x 10^24 molecules of Fe(OH)₃
Answer: There are 1.41 x 10^24 molecules of Fe(OH)₃
Name three different forms of mixture
Answer:
Mixtures can be classified on the basis of particle size into three different types: solutions, suspensions and colloids. The components of a mixture retain their own physical properties.
Sorry for the bad English, love from Vanuatu!
Explanation:
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.
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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How much water needs to be added to a 8.6317 M NaCl solution to obtain a 1.0421 M solution, if you start with 4.7869 liters of solution?
The amount of water needed to be added to a 8.6317 M NaCl solution to obtain a 1.0421 M solution starting with 4.7869 liters of solution would be 34.8629 L.
DilutionThe problem here has to do with dilution. The dilution principle states that the number of moles of solute in a solution is constant before and after dilution.
In other words, the dilution principle can be mathematically expressed as:
[tex]m_1v_1[/tex] = [tex]m_2v_2[/tex].
Where [tex]m_1[/tex] and [tex]m_2[/tex] are molarities before and after dilution; [tex]v_1[/tex] and [tex]v_2[/tex] are volumes before and after dilution.
In this case: [tex]m_1[/tex] = 8.6317 M, [tex]m_2[/tex]= 1.0421 M, [tex]v_1[/tex]= 4.7869 L. We are to determine v2.
[tex]v_2[/tex] = [tex]m_1v_1[/tex]/ [tex]m_2[/tex]
= 8.6317x4.7869/1.0421
= 39.6498 L
If the final volume of the solution is 39.6498 L and the starting volume is 4.7869, then the amount of water needed can be calculated as:
39.6498 - 4.7869 = 34.8629 L
Thus, the amount of water that will be added to the original solution in order to arrive at the diluted solution is 34.8629 L.
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how many molecules are there in 2.13 moles of sodium bromide
Answer:
121 I think not sure tbh......
The sheet of gold foil Rutherford used was 304 mm wide and 0.016 mm thick. What maximum length of gold foil could be made from 1.10 x 103 g of gold?
The maximum length of gold foil could be 1171.7 cm made from 1.10 x 10³ g of gold.
What is the density?The density of an object can be described as the mass per unit volume. The average density is equal to the total mass divided by its total volume.
The mathematical formula of the density of the material can be expressed as follows:
Density = Mass/Volume
The density of a substance is an intrinsic property as it doesn't depend on its size and the S.I. unit of the density is Kg/m³.
Given the width of the gold foil, w = 304 mm = 30.4 cm
The height or thickness of the foil, h = 0.016 mm = 0.0016 cm
The density of the gold foil, d = 19.3 g/cm³
The mass of the gold given, m = 1100 g
The volume of the foil = m/d = 1100/ 19.3 = 56.99 g/cm³
As we know that the volume of gold foil , V = l × w × h
l = V/(w × h)
l = 56.99/(30.4 × 0.0016)
l =1171.7 cm
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How much heat is released when 245 g of steam cools from 106.0°C to -4.5°C
ANSWER
The amount of heat released is -54, 957.175J
EXPLANATION
Given that;
[tex]\begin{gathered} \text{ The mass of the steam is 245g} \\ \text{ The final temperature of the steam is -4.5}\degree C \\ \text{ The initial temperature of the steam is 106.0}\degree C \end{gathered}[/tex]To find the amount of energy released, then apply the below formula
[tex]\text{ q = mc \lparen}\theta2\text{ - }\theta1)[/tex]Recall, that the specific heat capacity of steam (c) is 2.03 J/g degrees Celcius
[tex]\begin{gathered} \text{ q = 245 }\times\text{ 2.03 \lparen-4.5 - 106\rparen} \\ \text{ q = 245 }\times\text{ 2.03 \lparen -110.5\rparen} \\ \text{ q = -54,957.175J} \end{gathered}[/tex]Therefore, the amount of heat released is -54, 957.175J
According to Bronsted-Lowry Theory, a base is.....Group of answer choicesa H+ donora H+ acceptora OH- donorwater
answer and explanation
a bronsted-lowry basic is a H+ donor
What volume of Cl2 gas, measured at 688 torr and 36 °C, is required to form 22 g of NaCl?Express your answer using two significant figures.
ANSWER
Volume of the gas 5.3L
EXPLANATION;
Given that
The pressure of the chlorine gas is 688 torr
The temperature of the chlorine gas is 36 degrees Celcius
The mass of NaCl is 22 grams
Follow the steps below to find the volume of chlorine gas
Step 1; Write a balanced equation for the reaction
[tex]\text{ 2Na + Cl}_2\text{ }\rightarrow\text{ 2NaCl}[/tex]In the above reaction, 2 moles of Na react with 1 mole of chlorine to form 2 moles of NaCl
Step 2; Find the number of moles of NaCl using the below formula
[tex]\text{ mole = }\frac{\text{ mass}}{\text{ molar mass}}[/tex]Recall, that the molar mass of NaCl is 58.44 g/mol
[tex]\begin{gathered} \text{ mole = }\frac{22}{\text{ 58.44}} \\ \text{ moles = 0.376 mole} \end{gathered}[/tex]Step 3; Find the number of moles of Cl2 using a stoichiometry ratio
Let x represents the number of moles of Cl2
[tex]\begin{gathered} 1\text{ mole Cl}_2\text{ }\rightarrow\text{ 2 moles NaCl} \\ \text{ x moles Cl}_2\rightarrow\text{ 0.376 moles NaCl} \\ \text{ cross multiply} \\ \text{ x moles Cl}_2\text{ }\times2\text{ moles NaCl }=\text{ 1 mole Cl}_2\text{ }\times\text{ 0.376 mole NaCl} \\ \text{ Isolate x} \\ \text{ x = }\frac{\text{ 1 mole Cl}_2\times0.376moles\cancel{NaCl}}{2moles\cancel{NaCl}} \\ \\ \text{ x = }\frac{1\text{ }\times\text{ 0.376}}{2} \\ x\text{ = }\frac{0.376}{2} \\ \text{ x = 0.188 mol} \end{gathered}[/tex]The number of moles of Cl2 is 0.188 mol
Step 4; Find the volume of the gas using the ideal gas equation
[tex]\text{ PV = nRT}[/tex]Convert the temperature to degree kelvin
[tex]\begin{gathered} \text{ t = 36}\degree C \\ \text{ T = 36 + 273.15} \\ \text{ T = 309.15 K} \end{gathered}[/tex]Step 5; Find the volume of the gas
[tex]\begin{gathered} \text{ PV = nRT} \\ \text{ Recall, that R = 62.363 L. torr mol}^{-1}K^{-1} \\ \text{ 688}\times\text{ V =}^{\text{ }}0.188\text{ x 62.636 }\times\text{ 309.15} \\ \text{ 688 V = 3624. 500} \\ V\text{ = }\frac{\text{ 3645, 500}}{688} \\ \text{ v = 5.3 L} \end{gathered}[/tex]Therefore, volume of the gas 5.3L
Place these Types of Decay in Order from the LOWEST Energy to the HIGHEST energy.
Answer:
[tex]\begin{gathered} Alpha\text{ Decay} \\ Beta\text{ Decay} \\ Gamma\text{ Decay} \end{gathered}[/tex]Explanation:
Here, we want to order the radiations in terms of energy
There is a proportional relationship between the mass and the energy
It is established that the radiation with a higher mass would have the lesser energy
Alpha decay has the highest mass and thus, the lowest energy. This is followed by beta decay, and finally, gamma decay
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.
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
After centrifugation of the sample, the student was not careful and some of the solid was transferred to the Erlenmeyer flask along with the liquid (supernatant). How is this mistake expected to affect the mass of the limiting reactant in the unknown mixture used?
The fact that some of the solid was transferred would decrease the mass of the limiting reactant.
What is the limiting reactant?We know that in a chemical reaction, there are at least two substances that are combined in order to give the product of the reaction. We also know that the product that we obtain must be in accordance to the stoichiometry of the reaction.
It is common to see that one of the reactants would be present in a very large amount while the other reactant would be present only in quite a small amount. The reactant that is present in a small amount is said to be the limiting reactant while the one that is present in the large amount is said to be the reactant that is in excess.
Having said this, we know that the mass of the limiting reactant can be obtained from the mass of the solid that is obtained after the reaction.
If we do not take out all of the solid from the centrifuge, the mass would not be accurately weighed and the mass of the limiting reactant would not be accurately determined.
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A balloon has a volume of 1785 mL at 25°C, if the volume of balloon changes to 1.25 L, what is the new temperature in degree Celcius atconstant pressure and amount?
We work here with Charles' Law. The equation used here is:
V1/T1 = V2/T2 (1)
(pressure and amount constant)
V is for volume and T for temperature
V1 = 1785 mL
1 L = 1000 mL ==> V1 = 1.785 L
T1 = 25 °C = 25 °C + 273 = 298 K
V2 = 1.25 L
T2 = unknown
From (1) we clear T2:
T2 = V2 x T1/V1 = 1.25 L x 298 K/1.785 L = 209 K approx.
T2 = 209 K - 273 = -64 °C
Answer: T2 = -64 °C
Please if you could even help with one
The chart of given following ion is
Protons Electrons Neutrons
1) 6 2 8
2) 6 2 7
3) 8 10 9
4) 8 10 8
What are sub atomic particles ?Simply put, a subatomic particle is a particle that is smaller than an atom. Protons, electrons, and neutrons are the three subatomic particles that may typically be separated from an atom.
A neutral atom has the same number of protons and electrons as protons. The sum of the protons and neutrons in the atom's nucleus determines its mass, which is denoted by the letter M. The number of neutrons is equal to the discrepancy between the atomic number and the mass number of the atom (M) (Z).Learn more about Sub atomic particles here:
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If you add 8 g of salicylic acid to 84 g of an ointment base, what is the final concentration (w/w) of the product? Round to the nearest hundredths (w/w).Question 3 options:Answer will be in % nothing else! ACTIVE INGREDIENT will always be your numerator.NUMERATOR (ACTIVE INGREDIENT)--------------------------------DENOMINATOR (TOTAL) Numerator means the top part of your fractionThe (w/w) is telling you to divideSTEPS: Add 8 + 84 this will be your denominator totalthen multiply by 100 to add the % sign in #----- Divide = then multiply by 100 for the percent sign. What is your answer?#FINISH THE MATH FOR THE CORRECT ANSWER
Answer
Concentration = (8/92)*100 = 8.7%
Explanation
Given:
mass of salicylic acid (active ingredient) = 8 g
mass of an ointment base = 84 g
Required: concentration (w/w) of the product?
Solution:
Total mass of the mixture = 8 + 84 = 92 g
Concentration = (8/92)*100 = 8.7%
how did democritus model change throughout history write a paragraph using other theories about atoms.
Democritus proposed the idea that atoms were unique to the substance they were found .
How has the atomic model evolved through time?Model of Bohr (1913)
Niels Bohr made Rutherford's model better. He demonstrated, using mathematical concepts, that electrons reside in energy levels or shells surrounding the nucleus. Due to the discovery of subatomic particles, the Dalton model has evolved over time.
The importance of the atomic theoryAstonishing scientific advancements in fields like contemporary chemistry and nuclear energy resulted from the finding that all matter is composed of microscopic particles, which was made possible by the atomic theory.
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The______of photosynthesis are the____of cellular respirationmeaning their equation are the ame but_____of each other.
Answer:
reactants /products, products / reactants, opposite / inverse
I can't exactly tell how many underscores there are.
Explanation:
This is biology, but it does contain chemistry.
3.(a) Draw the following five-carbon hydrocarbons:•Pentane•Pentene•Pentyne(e)Classify each molecule and explain the differences between them. (Classes of organic molecules include alkanes, alkenes, alkynes, alcohols, carboxylic acids, aldehydes, ketones, esters, ethers, amines, and amides.)
Structural formulas are ways atoms and elements are arranged in a molecule. The structural formula of pentane, pentene, and pentyne are as shown below;
Pentane - C5H12
Pentene - C5H10
Pentyne - C5H8
e) Pentane is an alkane compound with a general formula CnH2n+2. The chemical formula of pentane is C5H12. There are only single bonds between the C-H atoms in the molecule.
Pentene is an alkene compound with a general formula of CnH2n. The chemical formula of pentene is C5H10. There is a double bond present between the C=H atoms. This double bond shows that the compound is an alkene.
Pentyne is an alkyne compound with a general formula of CnH2n-2. The chemical formula of pentene is C5H8. There is a triple bond present between the Carbon Hydrogen atoms. This presence of a triple bond shows that the molecule is an alkyne compound.
Recall the postulates of kinetic-molecular theory. Read the list and check all the statements that apply to the behavior of an ideal gas:1. gas particles behave like hard spheres2. gas particles travel randomly3. gas particles are attracted to each other4. energy is lost when gas particles collide 5. average kinetic energy of a collection of gas particles depends on the temperature6. gas particles occupy most of the space within a container7. gas particles have mass and volume
Answer:
Chemistry - States of matter - Kinetic Molecular Theory
This is the theory that explains the states of the matter and is based on the idea that matter is composed of tiny particles that are always on motion.
Part 1: Check all the statements that apply to the behavior of an ideal gas
The behaviors that apply are:
1.Gas paarticles behave like hard sphares.
2.Gas particles travel randomly.
5. Average kinetic energy of a collection of gas particles depends on the temperature.
Part 2: According to kinetic-molecular theory the one that would not be considered an ideal gas is:
A gas with highly polar molecules that have very strong intermolecular forces.
This is because the theory consideres thhat there are no forces of attraction of repultion between gas particles.
i need to put 5 grams of hydrogen through two sets of chemical reactions, one resulting in a covalent outcome, the other resulting in an ionic outcome. I also need to balance the equations used during this process as well as calculate the number of molecules produced by the covalent compound, and the mass of the ionic product.This is a big project in my chemistry class and I've chosen Hydrogen as my element to use throughout these chemical reactions. I will provide the assignment outline and the work I've done so far :)thank you so very much for the help!
2H2(g) +O2(g) → 2H2O(g)
Mass = 5 g : :
Moles = 4.96 : : 4.96
1.1 number of moles for hydrogen :
moles = mass /Molecular mass
= 5g/1,00784
=4.96 moles
1.2 Determine molar ratio in oder to get the moles for product 2H2O
we see that :
2 moles of Hydrogen produces: 2 moles of water
so, 4.96 moles of hydrogen will produce : x = 4.96*2 /2 = 4.96
This means that moles for water = 4.96
1.3 Calculating molecules of the productn = 4.96moles
Molecules of H2O = 4.96 mol * 6.022×10^23molecules/1mol
=2.99x10^24 molecules
A redox reaction:A. is a reaction where oxygen is returned it its natural state.B. is a reduction reaction where oxygen is removed.C. is comprised of two half reactions, a reduction and an oxidation.D. is a reaction where oxygen is added to a compound.
In this question, we have to classify what is a redox reaction, and as the name suggests, we have a reduction and an oxidation reaction occurring in this type of reaction, where one element will lose electrons, or will be oxidized, and another element will gain electrons or will be reduced. Therefore the best answer will be letter C
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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25.0 mL of a solution with concentration 0.30 M is diluted to a final volume of 150. mL. What is the final concentration?
Answer: the concentration of the solution after the dllution is 0.050 M
Explanation:
The question requires us to determine the concentration of a solution after a dilution process.
The following information was provided by the question:
Concentration of initial solution = C1 = 0.30 M
Volume taken from initial solution = V1 = 25.0 mL
Volume of final solution = V2 = 150 mL
When a solution is diluted, the number of moles of the substance remains the same. Thus, we can say that:
[tex]n_1=n_2[/tex]where (1) is the solution before dilution and (2) refers to the solution after dilution.
The number of moles of a substance can be obtained from the definition of molarity (or molar concentration), where the number of moles is divided by the volume of the solution:
[tex]molarity=\frac{number\text{ of moles}}{volume}\rightarrow number\text{ of moles = molarity}\times volume\rightarrow n=C\times V[/tex]Thus, we can write that for a dillution:
[tex]n_1=n_2\rightarrow C_1\times V_1=C_2\times V_2[/tex]From the expression above we can determine the concentration of the final solution. Applying the values provided by the question to the expression above, we'll have:
[tex]\begin{gathered} \begin{equation*} C_1\times V_1=C_2\times V_2 \end{equation*} \\ \\ (0.30M)\times(25.0mL)=C_2\times(150mL) \\ \\ C_2=\frac{(0.30M)\times(25.0mL)}{(150mL)}=0.050M \end{gathered}[/tex]Therefore, the concentration of the solution after the dilution is 0.050 M.
Add 43.8lbs and 56.8923lbs. What is the answer in the correct significant figures?
The answer in correct significant figures of the addition of the two numbers mentioned is 100.70.
What are significant figures?Significant figures are used for establishment of a number which is presented in the form of digits. These digits give a meaningful representation to the numbers.
The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.There are rules for counting significant figures which are as follows:
1)All non-zero digits are significant .
2)All zeroes which occur between non-zero digits are significant.
3)All zeroes to the left and right of a non-zero digit are not significant.
4) All zeroes on right of decimal are significant if a non-zero number follows them.
5)All zeroes on right side of non-zero digit are significant.
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If the mercury in a barometer raises 22.8 centimeters due to a change in ambient pressure, what is the corresponding change in pressure in atm?
If the mercury in a barometer raises 22.8 centimeters due to a change in ambient pressure, then the corresponding change in pressure would be 0.3 atm.
What is pressure?The total applied force per unit of area is known as the pressure.
The pressure depends both on externally applied force as well the area on which it is applied
As given in the problem If the mercury in a barometer raises 22.8 centimeters due to a change in ambient pressure, then we have to find out the corresponding change in pressure in atm,
760 mm of Hg = 1 atm
76 cm of Hg = 1 atm
1 cm of Hg = 1 / 76 atm
22.8 cm of Hg = 22.8 / 76 atm
= 0.3 atm
Thus , the corresponding change in pressure in atm would be 0.3 atm .
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CanvasX &Question 16Consider the reaction: 4Na(s) + O2(8) → 2Na2O(s)
ANSWER
The mass of Na2O in grams is 123.49 grams
EXPLANATION:
Given information
The mass of sodium is 91 grams
The mass of oxygen is 34.0 grams
To find the amount of Na2O produced, follow the steps below
Step 1: Write the balanced equation of the reaction
[tex]\text{ 4Na}_{(s)}\text{ + O}_{2(g)}\rightarrow\text{ 2Na}_2O_{(S)}[/tex]Step 2: Find the number of moles of sodium and oxygen using the formula below
[tex]\text{ Mole = }\frac{\text{ mass}}{molar\text{ mass}}[/tex]Recall, that the molar mass of Na is 22.989 g/mol, and the molar mass of oxygen atom is 32 g/mol
For Na
[tex]\begin{gathered} \text{ Mole = }\frac{mass}{molar\text{ mass}} \\ \text{ Mole = }\frac{91.6}{22.989} \\ \text{ Mole = 3.985 moles} \end{gathered}[/tex]For O2
[tex]\begin{gathered} \text{ Mole = }\frac{mass}{molar\text{ mass}} \\ \text{ } \\ \text{ Mole = }\frac{34}{32} \\ \text{ Mole = 1.0625 moles} \end{gathered}[/tex]Step 3: Find the limiting reactant of the reaction
The limiting reactant is the reactant that has the least number of moles after dividing it by the coefficient of the reactant
From the reaction above, you will see that 4 moles of sodium react with one mole of oxygen to give 2 moles of sodium oxide.
For Na
[tex]\begin{gathered} \text{ Na = }\frac{\text{ number of moles}}{\text{ coefficient}} \\ \text{ Na = }\frac{3.985}{4} \\ \text{ Na = 0.99625 mole/wt} \\ \\ \text{ For O}_2 \\ \text{ O}_2\text{ = }\frac{1.0625}{1} \\ \text{ O}_2\text{ = 1.0625 moles/wt} \end{gathered}[/tex]From the above calculations, you will see that Na has the least number of moles, hence, Na is the limiting reactant
Step 4: Find the number of moles of Na2O
The Na2O can be determined using a stoichiometric ratio
Let x represents the number of moles
[tex]\begin{gathered} \text{ 4 moles of Na }\rightarrow\text{ 2 moles of Na}_2O \\ 3.985\text{ moles of Na }\rightarrow\text{ x moles of Na}_2O \\ \text{ cross multiply} \\ \text{ 4 moles of Na }\times\text{ x moles of Na}_2O\text{ = 2 moles of Na}_2O\times3.985\text{ moles of Na} \\ \text{ x moles of Na}_2O\text{ = }\frac{2\cancel{moles\text{ of Na}_2}O\times3.985\cancel{moles\text{ of Na}}}{4\cancel{moles\text{ of Na}}} \\ \text{ x moles of Na}_2O\text{ = }\frac{2\times\text{ 3.985}}{4} \\ \text{ X moles of Na}_2O\text{ = 1.9925 moles} \end{gathered}[/tex]Hence, the number of moles of Na2O is 1.9925 moles
Step 5: Find the mass of Na2O
[tex]\begin{gathered} \text{ Mole = }\frac{\text{ mass}}{\text{ molar mass}} \\ \end{gathered}[/tex]Recall, that the molar mass of Na2O is 61.9789 g/mol
[tex]\begin{gathered} \text{ 1.9925 = }\frac{\text{ mass}}{61.978} \\ \text{ Cross multiply} \\ \text{ Mass = 1.9925}\times61.978 \\ \text{ Mass = 123.49 grams} \end{gathered}[/tex]Hence, the mass of Na2O in grams is 123.49 grams
Determine whether each combination will produce aprecipitate. If a precipitate forms, enter its chemicalormula. If no precipitate forms, enter NONEHg2(NO3)2(aq) + BaCl₂(aq)H₂SO4(aq) + NaOH(aq)AgCH3CO₂(aq) + Cs₂SO4(aq)NH4Br(aq) + K3PO4(aq)
First, we have to complete the reactions with the respective products:
[tex][/tex]How many moles of ammonium nitrate (NH4NO3) are present in 0.085 L of a 0.23 M ammonium nitrate (NH4NO3) solution?
Answer:
No. of moles [tex]\approx[/tex] 0.020
Explanation:
To calculate the number of moles of a substance in a solution given its concentration and volume, we use the following formula:
[tex]\boxed{\mathrm{No. \ of \ moles = Concentration \times Volume}}[/tex],
where concentration is in mol/dm³ (or M) and volume is in L.
In the question, we are told that the volume of the solution is 0.085 L and that its concentration is 0.23 M. Substituting these values into the formula above, we get:
No. of moles = 0.23 × 0.085
= 0.01955
[tex]\approx[/tex] 0.020 mol (3 s.f.)
Therefore, there are 0.020 moles of NH₄NO₃ in the solution.
identify the functional group and name the compound ch3ch2ch2ch2ch2ch2cho
Answer: valeraldehyde
Explanation:
I had to memorize this one
The functional group present is aldehyde and name of compound is valeraldehyde.
What are functional groups?Functional group is defined as a substituent or group of toms or an atom which causes chemical reactions.Each functional group will react similarly regardless to the parent carbon chain to which it is attached.This helps in prediction of chemical reactions.
The reactivity of functional group can be enhanced by making modifications in the functional group .Atoms present in functional groups are linked to each other by means of covalent bonds.They are named along with organic compounds according to IUPAC nomenclature.
Functional group inter conversion is also possible by retro -synthesis.In some cases , functional groups can be charged molecules.
Learn more about functional groups,here:
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