Question 1

How many grams of H2O are there in 10.0 g of tetraphenylarsonium chloride dihydrate,

Accepted Answer

A) 0.860 g 
B) 0.792 g 
C) 0.430 g 
D) 0.396 g 
E) 0.239 g 
A) 0.860 g 
B) 0.792 g 
C) 0.430 g 
D) 0.396 g 
E) 0.239 g

Question 2

How many grams of O are found in 1.00 × 102 g of K2Cr2O7?

Accepted Answer

A) 14.9 g 
B) 38.1 g 
C) 5.44 g 
D) 11.3 g 
E) 78.8 g 
A) 14.9 g 
B) 38.1 g 
C) 5.44 g 
D) 11.3 g 
E) 78.8 g

Question 3

The simplest formula of a substance is found to be CH2O,and its approximate molar mass is found by experiment to be 93 grams/mole.What is the exact molar mass of this substance in grams/mole?

Accepted Answer

A) 30.0 
B) 87.0 
C) 90.1 
D) 93.0 
E) 93.1 
A) 30.0 
B) 87.0 
C) 90.1 
D) 93.0 
E) 93.1

Question 4

Choose the INCORRECT name/formula combination.

Accepted Answer

A) NaClO sodium hypochlorite 
B) NaClO4 sodium chlorate 
C) NaClO2 sodium chlorite 
D) Sr(IO3)2 strontium iodate 
E) SCl4 sulfur tetrachloride 
A) NaClO sodium hypochlorite 
B) NaClO4 sodium chlorate 
C) NaClO2 sodium chlorite 
D) Sr(IO3)2 strontium iodate 
E) SCl4 sulfur tetrachloride

Question 5

How many hydrogen atoms are present in 2.84 moles of water?

Accepted Answer

A) 3.42 × 1024 H atoms 
B) 1.71 × 1024 H atoms 
C) 4.24 × 1023 H atoms 
D) 9.44 × 1024 H atoms 
E) 3.42 × 1023 H atoms 
A) 3.42 × 1024 H atoms 
B) 1.71 × 1024 H atoms 
C) 4.24 × 1023 H atoms 
D) 9.44 × 1024 H atoms 
E) 3.42 × 1023 H atoms

Question 6

Polyatomic ions end in -ate or -ite.

Accepted Answer

A) True 
 B)False

Question 7

The formula of barium nitride is ________.

Accepted Answer

A) Ba3N2 
B) Ba2N2 
C) BaN 
D) Ba2N 
A) Ba3N2 
B) Ba2N2 
C) BaN 
D) Ba2N

Question 8

A 2.000 g sample of water contains 11.19% H by mass and 88.81% O by mass.What percent of H by mass will be found in a 6.00 g sample of water?

Accepted Answer

A) 33.33% 
B) 88.81% 
C) 5.60% 
D) 33.57% 
E) 11.19% 
A) 33.33% 
B) 88.81% 
C) 5.60% 
D) 33.57% 
E) 11.19%

Question 9

What is the mass of 0.500 mol of dichlorodifluoromethane,CCl2F2?

Accepted Answer

A) 4.14 × 10-3 g 
B) 60.5 g 
C) 121 g 
D) 242 g 
A) 4.14 × 10-3 g 
B) 60.5 g 
C) 121 g 
D) 242 g

Question 10

Hydrates are:

Accepted Answer

A) moisture sensitive hygroscopic inorganic salts 
B) compounds in which each formula unit has one or more water molecules associated with it 
C) readily soluble in water and release energy 
D) organic compounds that contain oxygen together with usual carbon and hydrogen 
E) concentrated solutions of salts in water 
A) moisture sensitive hygroscopic inorganic salts 
B) compounds in which each formula unit has one or more water molecules associated with it 
C) readily soluble in water and release energy 
D) organic compounds that contain oxygen together with usual carbon and hydrogen 
E) concentrated solutions of salts in water

Question 11

How many Fe(II)ions are there in 20.0 g of FeSO4?

Accepted Answer

A) 2.19 × 10-25 iron(II)ions 
B) 7.92 × 1022 iron(II)ions 
C) 4.57 × 1024 iron(II)ions 
D) 1.82 × 1027 iron(II)ions 
A) 2.19 × 10-25 iron(II)ions 
B) 7.92 × 1022 iron(II)ions 
C) 4.57 × 1024 iron(II)ions 
D) 1.82 × 1027 iron(II)ions

Question 12

The molecular formula for caffeine is C8H10O2N4.How many moles of C atoms are present in a 2.0 g sample of caffeine?

Accepted Answer

A) 0.32 mole 
B) 0.27 mole 
C) 0.041 mole 
D) 0.082 mole 
E) 0.010 mole 
A) 0.32 mole 
B) 0.27 mole 
C) 0.041 mole 
D) 0.082 mole 
E) 0.010 mole

Question 13

4.72 g of a compound of carbon,hydrogen,and silver was burned in an atmosphere of oxygen,yielding 7.95 g of CO2,1.02 g of H2O,and 3.02 g of a mixture of silver and silver oxide.Because the production of this mixture yielded an indeterminate value for the amount of silver,another sample of the compound weighing 8.12 g was reacted with a solution of NaCl,yielding 5.57 g of AgCl.What is the empirical formula of the compound?

Accepted Answer

A) C5H5Ag 
B) C8H8Ag 
C) C8H5Cl 
D) C8H5Ag 
E) C5H8Ag 
A) C5H5Ag 
B) C8H8Ag 
C) C8H5Cl 
D) C8H5Ag 
E) C5H8Ag

Question 14

The structural formula is the simplest formula.

Accepted Answer

A) True 
 B)False

Question 15

Maprotiline,a tetracyclic drug prescribed for the treatment of depression,has the following mass composition: 
C  86.59 % , H  8.35 % , and the rest is nitrogen.
The empirical formula of maprotiline is ________.

Accepted Answer

A) C7H8N3  
B) C20H23N 
C) C87H8N5  
D) C3H3N 
E) C14H14N 
A) C7H8N3  
B) C20H23N 
C) C87H8N5  
D) C3H3N 
E) C14H14N

Question 16

The oxidation state of vanadium in VO2+ is ________.

Accepted Answer

A) -2 
B) +2 
C) +1 
D) -4 
E) +4 
A) -2 
B) +2 
C) +1 
D) -4 
E) +4

Question 17

Hydrocarbons contain only carbon and hydrogen.

Accepted Answer

A) True 
 B)False

Question 18

A 1.500 g sample of compound containing only C,H,and O was burned completely.The only combustion products were 1.738 g CO2 and 0.711 g H2O.What is the empirical formula of the compound?

Accepted Answer

A) CH2O2  
B) CH2O 
C) C2H4O3  
D) CHO 
E) CH4O 
A) CH2O2  
B) CH2O 
C) C2H4O3  
D) CHO 
E) CH4O

Question 19

Complete combustion of a 0.500 g sample of a pure hydrocarbon yielded 0.973 g CO2 and 0.319 g H2O.The empirical formula of this hydrocarbon is ________.

Accepted Answer

A) C3H5  
B) C2H3  
C) C4H6  
D) C5H8  
E) C6H9  
A) C3H5  
B) C2H3  
C) C4H6  
D) C5H8  
E) C6H9

Question 20

2.404 g of a compound were burned in oxygen and found to produce only 3.520 g CO2(g),2.564 g SO2(g)and 1.440 g H2O(l).Determine the empirical formula of the compound.

Accepted Answer

A) CSH 
B) C2SH4  
C) C4SH2  
D) C2S2H4  
E) C2SH2  
A) CSH 
B) C2SH4  
C) C4SH2  
D) C2S2H4  
E) C2SH2

Exam 3: Chemical Compounds

How many grams of H2O are there in 10.0 g of tetraphenylarsonium chloride dihydrate,

How many grams of O are found in 1.00 × 102 g of K2Cr2O7?

The simplest formula of a substance is found to be CH2O,and its approximate molar mass is found by experiment to be 93 grams/mole.What is the exact molar mass of this substance in grams/mole?

Choose the INCORRECT name/formula combination.

How many hydrogen atoms are present in 2.84 moles of water?

Polyatomic ions end in -ate or -ite.

The formula of barium nitride is ________.

A 2.000 g sample of water contains 11.19% H by mass and 88.81% O by mass.What percent of H by mass will be found in a 6.00 g sample of water?

What is the mass of 0.500 mol of dichlorodifluoromethane,CCl2F2?

Hydrates are:

How many Fe(II)ions are there in 20.0 g of FeSO4?

The molecular formula for caffeine is C8H10O2N4.How many moles of C atoms are present in a 2.0 g sample of caffeine?

The structural formula is the simplest formula.

Maprotiline,a tetracyclic drug prescribed for the treatment of depression,has the following mass composition: C 86.59 % , H 8.35 % , and the rest is nitrogen. The empirical formula of maprotiline is ________.

The oxidation state of vanadium in VO2+ is ________.

Hydrocarbons contain only carbon and hydrogen.

A 1.500 g sample of compound containing only C,H,and O was burned completely.The only combustion products were 1.738 g CO2 and 0.711 g H2O.What is the empirical formula of the compound?

Complete combustion of a 0.500 g sample of a pure hydrocarbon yielded 0.973 g CO2 and 0.319 g H2O.The empirical formula of this hydrocarbon is ________.

2.404 g of a compound were burned in oxygen and found to produce only 3.520 g CO2(g),2.564 g SO2(g)and 1.440 g H2O(l).Determine the empirical formula of the compound.

Matter: Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Valence Bond and Molecular Orbital Theories

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

How many grams of H₂O are there in 10.0 g of tetraphenylarsonium chloride dihydrate,

How many grams of O are found in 1.00 × 10² g of K₂Cr₂O₇?

The simplest formula of a substance is found to be CH₂O,and its approximate molar mass is found by experiment to be 93 grams/mole.What is the exact molar mass of this substance in grams/mole?

What is the mass of 0.500 mol of dichlorodifluoromethane,CCl₂F₂?

How many Fe(II)ions are there in 20.0 g of FeSO₄?

The molecular formula for caffeine is C₈H₁₀O₂N₄.How many moles of C atoms are present in a 2.0 g sample of caffeine?

The oxidation state of vanadium in VO²⁺ is ________.

A 1.500 g sample of compound containing only C,H,and O was burned completely.The only combustion products were 1.738 g CO₂ and 0.711 g H₂O.What is the empirical formula of the compound?

Complete combustion of a 0.500 g sample of a pure hydrocarbon yielded 0.973 g CO₂ and 0.319 g H₂O.The empirical formula of this hydrocarbon is ________.

2.404 g of a compound were burned in oxygen and found to produce only 3.520 g CO₂(g),2.564 g SO₂(g)and 1.440 g H₂O(l).Determine the empirical formula of the compound.