Question 1

The chemical formula CuBr2 indicates that this compound is composed of 1 gram of copper and   of bromine.

Accepted Answer

A) True 
 B)False

Question 2

How many atoms are in 5.80 moles of He?

Accepted Answer

A) 6.02 × 1023 
B) 1.03 × 1023 
C) 4.00 
D) 3.49 × 1024 
E) none of the above 
A) 6.02 × 1023 
B) 1.03 × 1023 
C) 4.00 
D) 3.49 × 1024 
E) none of the above

Question 3

C2H6O4 could be an empirical formula.

Accepted Answer

A) True 
 B)False

Question 4

How many atoms are present in 4.5 moles?

Accepted Answer

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

Question 5

One mole of ammonium nitrite contains:

Accepted Answer

A) 2 moles of nitrogen atoms. 
B) 4 moles of hydrogen atoms. 
C) 2 moles of oxygen atoms. 
D) All of A,B,and C. 
E) None of A,B,and C. 
A) 2 moles of nitrogen atoms. 
B) 4 moles of hydrogen atoms. 
C) 2 moles of oxygen atoms. 
D) All of A,B,and C. 
E) None of A,B,and C.

Question 6

C2H6O3 could be an empirical formula.

Accepted Answer

A) True 
 B)False

Question 7

An empirical formula gives the smallest whole number ratio of each type of atom in a molecule.

Accepted Answer

A) True 
 B)False

Question 8

A 15.5 gram sample of diphosphorous pentoxide contains how many grams of phosphorous?

Accepted Answer

A) 3.38 
B) 1.69 
C) 6.76 
D) 13.5 
E) none of the above 
A) 3.38 
B) 1.69 
C) 6.76 
D) 13.5 
E) none of the above

Question 9

Which of the following statements about empirical formulas is incorrect?

Accepted Answer

A) An empirical formula represents a molecule. 
B) An empirical formula gives the smallest whole number ratio of each type of atom in a molecule. 
C) An empirical formula must be multiplied by an integer to obtain the molecular formula. 
D) The molecular formula can be the same as the empirical formula in some situations. 
E) All statements are correct. 
A) An empirical formula represents a molecule. 
B) An empirical formula gives the smallest whole number ratio of each type of atom in a molecule. 
C) An empirical formula must be multiplied by an integer to obtain the molecular formula. 
D) The molecular formula can be the same as the empirical formula in some situations. 
E) All statements are correct.

Question 10

Which of the following contains 9.02 × 1023 atoms?

Accepted Answer

A) 4.00 g H2 
B) 9.00 g H2O 
C) 28.0 g N2 
D) 32.0 g O2 
E) none of the above 
A) 4.00 g H2 
B) 9.00 g H2O 
C) 28.0 g N2 
D) 32.0 g O2 
E) none of the above

Question 11

The lighter the atom,the less mass in one mole of that atom.

Accepted Answer

A) True 
 B)False

Question 12

There are 6 grams of carbon in 22 grams of carbon dioxide.

Accepted Answer

A) True 
 B)False

Question 13

An iron chloride compound contains 55.85 grams of iron and 106.5 grams of chlorine.What is the most likely empirical formula for this compound?

Accepted Answer

A) FeCl 
B) FeCl2 
C) Fe2Cl 
D) FeCl3 
E) Fe3Cl 
A) FeCl 
B) FeCl2 
C) Fe2Cl 
D) FeCl3 
E) Fe3Cl

Question 14

Bauxite is an ore that contains the element aluminum.If you obtained 108 grams of aluminum from an ore sample that initially weighed 204 grams,what is the mass percent of aluminum in this bauxite ore?

Accepted Answer

A) 52.9 
B) 15.6 
C) 0.53 
D) 47.1 
E) none of the above 
A) 52.9 
B) 15.6 
C) 0.53 
D) 47.1 
E) none of the above

Question 15

Determine the empirical formula of a compound containing 60.3% magnesium and 39.7% oxygen.

Accepted Answer

A) MgO 
B) MgO2 
C) Mg2O3 
D) Mg2O 
E) none of the above 
A) MgO 
B) MgO2 
C) Mg2O3 
D) Mg2O 
E) none of the above

Question 16

One mole of water contains 16 grams of oxygen atoms.

Accepted Answer

A) True 
 B)False

Question 17

An estrogen compound with the empirical formula C12H17O2 has a molecular mass of 386.6 g/mol.What is the value of n necessary to find the molecular formula?

Accepted Answer

A) 0.2 
B) 1 
C) 2 
D) 20 
E) none of the above 
A) 0.2 
B) 1 
C) 2 
D) 20 
E) none of the above

Question 18

How many moles of potassium are in 156.4 g?

Accepted Answer

A) 39.10 
B) 4.000 
C) 0.2500 
D) 5.050 
E) none of the above 
A) 39.10 
B) 4.000 
C) 0.2500 
D) 5.050 
E) none of the above

The chemical formula CuBr₂ indicates that this compound is composed of 1 gram of copper and of bromine.

How many atoms are in 5.80 moles of He?

C₂H₆O₄ could be an empirical formula.

How many atoms are present in 4.5 moles?

One mole of ammonium nitrite contains:

C₂H₆O₃ could be an empirical formula.

An empirical formula gives the smallest whole number ratio of each type of atom in a molecule.

A 15.5 gram sample of diphosphorous pentoxide contains how many grams of phosphorous?

Which of the following statements about empirical formulas is incorrect?

Which of the following contains 9.02 × 10²³atoms?

The lighter the atom,the less mass in one mole of that atom.

There are 6 grams of carbon in 22 grams of carbon dioxide.

An iron chloride compound contains 55.85 grams of iron and 106.5 grams of chlorine.What is the most likely empirical formula for this compound?

Bauxite is an ore that contains the element aluminum.If you obtained 108 grams of aluminum from an ore sample that initially weighed 204 grams,what is the mass percent of aluminum in this bauxite ore?

Determine the empirical formula of a compound containing 60.3% magnesium and 39.7% oxygen.

One mole of water contains 16 grams of oxygen atoms.

An estrogen compound with the empirical formula C₁₂H₁₇O₂ has a molecular mass of 386.6 g/mol.What is the value of n necessary to find the molecular formula?

How many moles of potassium are in 156.4 g?

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 chemical formula CuBr2 indicates that this compound is composed of 1 gram of copper and of bromine.

How many atoms are in 5.80 moles of He?

C2H6O4 could be an empirical formula.

How many atoms are present in 4.5 moles?

One mole of ammonium nitrite contains:

C2H6O3 could be an empirical formula.

An empirical formula gives the smallest whole number ratio of each type of atom in a molecule.

A 15.5 gram sample of diphosphorous pentoxide contains how many grams of phosphorous?

Which of the following statements about empirical formulas is incorrect?

Which of the following contains 9.02 × 1023 atoms?

The lighter the atom,the less mass in one mole of that atom.

There are 6 grams of carbon in 22 grams of carbon dioxide.

An iron chloride compound contains 55.85 grams of iron and 106.5 grams of chlorine.What is the most likely empirical formula for this compound?

Bauxite is an ore that contains the element aluminum.If you obtained 108 grams of aluminum from an ore sample that initially weighed 204 grams,what is the mass percent of aluminum in this bauxite ore?

Determine the empirical formula of a compound containing 60.3% magnesium and 39.7% oxygen.

One mole of water contains 16 grams of oxygen atoms.

An estrogen compound with the empirical formula C12H17O2 has a molecular mass of 386.6 g/mol.What is the value of n necessary to find the molecular formula?

How many moles of potassium are in 156.4 g?

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

The chemical formula CuBr₂ indicates that this compound is composed of 1 gram of copper and of bromine.

C₂H₆O₄ could be an empirical formula.

C₂H₆O₃ could be an empirical formula.

Which of the following contains 9.02 × 10²³atoms?

An estrogen compound with the empirical formula C₁₂H₁₇O₂ has a molecular mass of 386.6 g/mol.What is the value of n necessary to find the molecular formula?