Question 1

The mass of one mole of carbon dioxide is ________ g.

Accepted Answer

A) 28.01 
B) 384.4 
C) 32.00 
D) 44.01 
E) none of the above 
A) 28.01 
B) 384.4 
C) 32.00 
D) 44.01 
E) none of the above

Question 2

You have 10.0 g each of Na,C,Pb,Cu and Ne.Which contains the largest number of moles?

Accepted Answer

A) Na 
B) C 
C) Pb 
D) Cu 
E) Ne 
A) Na 
B) C 
C) Pb 
D) Cu 
E) Ne

Question 3

An unknown acid has a molar mass of 60.06 g/mol.Given the following percent composition,what is the molecular formula? 
  .

Accepted Answer

A) C3H4O3 
B) CH2O 
C) C2H4O2 
D) C6H12O6 
E) none of the above 
A) C3H4O3 
B) CH2O 
C) C2H4O2 
D) C6H12O6 
E) none of the above

Question 4

How many atoms are in 1.50 moles of fluorine gas?

Accepted Answer

A) 6.022 × 1023 
B) 9.03 × 1023 
C) 18.98 
D) 1.81 × 1024 
E) none of the above 
A) 6.022 × 1023 
B) 9.03 × 1023 
C) 18.98 
D) 1.81 × 1024 
E) none of the above

Question 5

An iron ore sample is found to be 35.00% Fe by mass.How many grams of ore are needed to obtain   of Fe?

Accepted Answer

A) 1297 
B) 158.9 
C) 295.1 
D) 350.0 
E) none of the above 
A) 1297 
B) 158.9 
C) 295.1 
D) 350.0 
E) none of the above

Question 6

What is the mass of 0.560 moles of chlorine gas?

Accepted Answer

A) 19.9 
B) 63.3 
C) 127 
D) 39.7 
E) none of the above 
A) 19.9 
B) 63.3 
C) 127 
D) 39.7 
E) none of the above

Question 7

The chemical formula clearly indicates the relationship between the mass of each element in the formula.

Accepted Answer

A) True 
 B)False

Question 8

One mole of potassium sulfate contains:

Accepted Answer

A) 4 moles of oxygen. 
B) 2 moles of sulfur. 
C) 1 mole of potassium. 
D) 3 moles of potassium. 
E) none of the above 
A) 4 moles of oxygen. 
B) 2 moles of sulfur. 
C) 1 mole of potassium. 
D) 3 moles of potassium. 
E) none of the above

Question 9

How many atoms are in 15.6 grams of silicon?

Accepted Answer

A) 2.64 × 1026 
B) 3.34 × 1023 
C) 0.555 
D) 438 
E) none of the above 
A) 2.64 × 1026 
B) 3.34 × 1023 
C) 0.555 
D) 438 
E) none of the above

Question 10

Vitamin C is known chemically by the name ascorbic acid.Determine the empirical formula of ascorbic acid if it is composed of 40.92% carbon,4.58% hydrogen,and 54.50% oxygen.

Accepted Answer

A) CHO 
B) CH2O 
C) C2H3O2 
D) C3H4O3 
E) none of the above 
A) CHO 
B) CH2O 
C) C2H3O2 
D) C3H4O3 
E) none of the above

Question 11

A compound has a molar mass of 180.18 g/mol.Given the following percent composition,calculate the molecular formula: 39.99% C,6.73% H,53.28% O.

Accepted Answer

A) CH3O2 
B) CH2O 
C) C3H6O3 
D) C6H12O6 
E) none of the above 
A) CH3O2 
B) CH2O 
C) C3H6O3 
D) C6H12O6 
E) none of the above

Question 12

How many moles are there in 17.5 grams of sodium?

Accepted Answer

A) 22.99 
B) 1.05 × 1025 
C) 0.761 
D) 1.31 
E) none of the above 
A) 22.99 
B) 1.05 × 1025 
C) 0.761 
D) 1.31 
E) none of the above

Question 13

The molar mass of a compound serves as a conversion factor between grams and moles.

Accepted Answer

A) True 
 B)False

Question 14

One mole of chlorine gas has a mass of 35.45 grams.

Accepted Answer

A) True 
 B)False

Question 15

The empirical formula mass is 18.0 and the molecular formula mass is 90,therefore n = 5.

Accepted Answer

A) True 
 B)False

Question 16

You have 10.0 g each of Na,C,Pb,Cu and Ne.Which contains the smallest number of moles?

Accepted Answer

A) Na 
B) C 
C) Pb 
D) Cu 
E) Ne 
A) Na 
B) C 
C) Pb 
D) Cu 
E) Ne

Question 17

Which of the following statements about the mole is FALSE?

Accepted Answer

A) One mole of atoms makes up an amount of atoms that can be seen with the naked eye. 
B) A mole of a monatomic element corresponds to one Avogadro's number of atoms. 
C) One mole of a monatomic element has a mass equal to its atomic mass expressed in grams. 
D) One mole of water contains 1/2 mole of oxygen atoms. 
E) none of the above 
A) One mole of atoms makes up an amount of atoms that can be seen with the naked eye. 
B) A mole of a monatomic element corresponds to one Avogadro's number of atoms. 
C) One mole of a monatomic element has a mass equal to its atomic mass expressed in grams. 
D) One mole of water contains 1/2 mole of oxygen atoms. 
E) none of the above

Question 18

Calculate the molar mass of ammonium carbonate.

Accepted Answer

A) 78.05 g/mol 
B) 88.05 g/mol 
C) 96.09 g/mol 
D) 112.09 g/mol 
E) none of the above 
A) 78.05 g/mol 
B) 88.05 g/mol 
C) 96.09 g/mol 
D) 112.09 g/mol 
E) none of the above

Question 19

How many atoms of lithium are in 18.7 g?

Accepted Answer

A)    
B)    
C)    
D)    
E) none of the above 
A)    
B)    
C)    
D)    
E) none of the above

Question 20

Bananas cost 33¢ per pound.If you spent $0.77,how many pounds of bananas did you purchase?

Accepted Answer

A) 2.33 
B) 1.73 
C) 0.429 
D) 2.01 
E) none of the above 
A) 2.33 
B) 1.73 
C) 0.429 
D) 2.01 
E) none of the above

The mass of one mole of carbon dioxide is ________ g.

You have 10.0 g each of Na,C,Pb,Cu and Ne.Which contains the largest number of moles?

An unknown acid has a molar mass of 60.06 g/mol.Given the following percent composition,what is the molecular formula? .

How many atoms are in 1.50 moles of fluorine gas?

An iron ore sample is found to be 35.00% Fe by mass.How many grams of ore are needed to obtain of Fe?

What is the mass of 0.560 moles of chlorine gas?

The chemical formula clearly indicates the relationship between the mass of each element in the formula.

One mole of potassium sulfate contains:

How many atoms are in 15.6 grams of silicon?

Vitamin C is known chemically by the name ascorbic acid.Determine the empirical formula of ascorbic acid if it is composed of 40.92% carbon,4.58% hydrogen,and 54.50% oxygen.

A compound has a molar mass of 180.18 g/mol.Given the following percent composition,calculate the molecular formula: 39.99% C,6.73% H,53.28% O.

How many moles are there in 17.5 grams of sodium?

The molar mass of a compound serves as a conversion factor between grams and moles.

One mole of chlorine gas has a mass of 35.45 grams.

The empirical formula mass is 18.0 and the molecular formula mass is 90,therefore n = 5.

You have 10.0 g each of Na,C,Pb,Cu and Ne.Which contains the smallest number of moles?

Which of the following statements about the mole is FALSE?

Calculate the molar mass of ammonium carbonate.

How many atoms of lithium are in 18.7 g?

Bananas cost 33¢ per pound.If you spent $0.77,how many pounds of bananas did you purchase?

The Chemical World

Measurement and Problem Solving

Matter and Energy

Atoms and Elements

Molecules and Compounds

Chemical Reactions

Quantities in Chemical Reactions

Electrons in Atoms and the Periodic Table

Chemical Bonding

Gases

Liquids, solids, and Intermolecular Forces

Solutions

Acids and Bases

Chemical Equilibrium

Oxidation and Reduction

Radioactivity and Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

Exam 6: Chemical Composition

The mass of one mole of carbon dioxide is ________ g.

You have 10.0 g each of Na,C,Pb,Cu and Ne.Which contains the largest number of moles?

An unknown acid has a molar mass of 60.06 g/mol.Given the following percent composition,what is the molecular formula? .

How many atoms are in 1.50 moles of fluorine gas?

An iron ore sample is found to be 35.00% Fe by mass.How many grams of ore are needed to obtain of Fe?

What is the mass of 0.560 moles of chlorine gas?

The chemical formula clearly indicates the relationship between the mass of each element in the formula.

One mole of potassium sulfate contains:

How many atoms are in 15.6 grams of silicon?

Vitamin C is known chemically by the name ascorbic acid.Determine the empirical formula of ascorbic acid if it is composed of 40.92% carbon,4.58% hydrogen,and 54.50% oxygen.

A compound has a molar mass of 180.18 g/mol.Given the following percent composition,calculate the molecular formula: 39.99% C,6.73% H,53.28% O.

How many moles are there in 17.5 grams of sodium?

The molar mass of a compound serves as a conversion factor between grams and moles.

One mole of chlorine gas has a mass of 35.45 grams.

The empirical formula mass is 18.0 and the molecular formula mass is 90,therefore n = 5.

You have 10.0 g each of Na,C,Pb,Cu and Ne.Which contains the smallest number of moles?

Which of the following statements about the mole is FALSE?

Calculate the molar mass of ammonium carbonate.

How many atoms of lithium are in 18.7 g?

Bananas cost 33¢ per pound.If you spent $0.77,how many pounds of bananas did you purchase?

The Chemical World

Measurement and Problem Solving

Matter and Energy

Atoms and Elements

Molecules and Compounds

Chemical Reactions

Quantities in Chemical Reactions

Electrons in Atoms and the Periodic Table

Chemical Bonding

Gases

Liquids, solids, and Intermolecular Forces

Solutions

Acids and Bases

Chemical Equilibrium

Oxidation and Reduction

Radioactivity and Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters