Question 1

What is the empirical formula of benzene,C6H6?

Accepted Answer

CH

Question 2

When 31.2 mL of 0.500 M AgNO3 is added to 25.0 mL of 0.300 M NH4Cl,how many grams of AgCl are formed?
AgNO3(aq)+ NH4Cl(aq)→ AgCl(s)+ NH4NO3(aq)

Accepted Answer

A) 1)07 g 
B) 2)24 g 
C) 3)31 g 
D) 6)44 g 
A) 1)07 g 
B) 2)24 g 
C) 3)31 g 
D) 6)44 g A

Question 3

How many cations are there in 10.0 g of sodium phosphate?

Accepted Answer

A) 3)67 × 1022 cations 
B) 1)10 × 1023 cations 
C) 9)87 × 1024 cations 
D) 2)96 × 1025 cations 
A) 3)67 × 1022 cations 
B) 1)10 × 1023 cations 
C) 9)87 × 1024 cations 
D) 2)96 × 1025 cations B

Question 4

If the density of ethanol,C2H5OH,is 0.789 g/mL.How many milliliters of ethanol are needed to produce 15.0 g of CO2 according to the following chemical equation?
C2H5OH(l)+ 3 O2(g)→ 2 CO2(g)+ 3 H2O(l)

Accepted Answer

A) 6)19 mL 
B) 9)95 mL 
C) 19.9 mL 
D) 39.8 mL 
A) 6)19 mL 
B) 9)95 mL 
C) 19.9 mL 
D) 39.8 mL

Question 5

Combustion analysis of a 0.675 g sample of an unknown compound that contains only carbon,hydrogen,and oxygen gives 0.627 g of CO2 and 1.534 g of H2O.The molecular mass of the unknown is

Accepted Answer

A) C3H6O. 
B) C6H12O2. 
C) C9H18O3. 
D) unable to be determined from this data. 
A) C3H6O. 
B) C6H12O2. 
C) C9H18O3. 
D) unable to be determined from this data.

Question 6

Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 30.0 g of aluminum.
_____ Al(s)+ _____ I2(s)→ _____ Al2I6(s)

Accepted Answer

A) 0)741 mol 
B) 1)67 mol 
C) 2)22 mol 
D) 3)33 mol 
A) 0)741 mol 
B) 1)67 mol 
C) 2)22 mol 
D) 3)33 mol

Question 7

How many milliliters of 0.550 M hydriodic acid are needed to react with 25.00 mL of 0.217 M CsOH?
HI(aq)+ CsOH(aq)→ CsI(aq)+ H2O(l)

Accepted Answer

A) 0)0158 mL 
B) 0)101 mL 
C) 9)86 mL 
D) 63.4 mL 
A) 0)0158 mL 
B) 0)101 mL 
C) 9)86 mL 
D) 63.4 mL

Question 8

Which one of the following statements about balanced equations is true? A reaction is balanced by

Accepted Answer

A) changing the charge on an ion. 
B) changing the formula of the molecule. 
C) multiplying by suitable coefficients. 
D) rearranging atoms in a molecule. 
A) changing the charge on an ion. 
B) changing the formula of the molecule. 
C) multiplying by suitable coefficients. 
D) rearranging atoms in a molecule.

Question 9

If 100.mL of 0.100 M Na2SO4 is added to 200.mL of 0.150 M NaCl,what is the concentration of Na+ ions in the final solution? Assume that the volumes are additive.

Accepted Answer

A) 0)133 M 
B) 0)167 M 
C) 0)250 M 
D) 0)350 M 
A) 0)133 M 
B) 0)167 M 
C) 0)250 M 
D) 0)350 M

Question 10

If unshaded spheres represent nitrogen atoms and shaded spheres represent oxygen atoms,which box represents reactants and which represents products for the reaction 2 NO2(g)→ 2 NO(g)+ O2 (g)?

Accepted Answer

A) box (a)reactants and box (b)products 
B) box (a)reactants and box (d)products 
C) box (c)reactants and box (b)products 
D) box (c)reactants and box (d)products 
A) box (a)reactants and box (b)products 
B) box (a)reactants and box (d)products 
C) box (c)reactants and box (b)products 
D) box (c)reactants and box (d)products

Question 11

What is the molar mass of 1-butene if 5.38 × 1016 molecules of 1-butene weigh 5.00 μg?

Accepted Answer

A) 56.0 g/mol 
B) 178 g/mol 
C) 224 g/mol 
D) 447 g/mol 
A) 56.0 g/mol 
B) 178 g/mol 
C) 224 g/mol 
D) 447 g/mol

Question 12

Which of the following has the greatest mass?

Accepted Answer

A) 6)02 × 1023 molecules of O2 
B) 16.0 g of O2 
C) 0)500 mol of O2 
D) All of these have the same mass. 
A) 6)02 × 1023 molecules of O2 
B) 16.0 g of O2 
C) 0)500 mol of O2 
D) All of these have the same mass.

Question 13

How many grams of AgNO3 are needed to make 250.mL of a solution that is 0.135 M?

Accepted Answer

A) 0)0917 g 
B) 0)174 g 
C) 5)73 g 
D) 91.7 g 
A) 0)0917 g 
B) 0)174 g 
C) 5)73 g 
D) 91.7 g

Question 14

How many grams of the excess reagent are left over when 6.00 g of CS2 gas react with 10.0 g of Cl2 gas in the following reaction:
CS2(g)+ 3 Cl2(g)→ CCl4(l)+ S2Cl2(l)

Accepted Answer

A) 2)42 g 
B) 2)77 g 
C) 3)58 g 
D) 4)00 g 
A) 2)42 g 
B) 2)77 g 
C) 3)58 g 
D) 4)00 g

Question 15

When 280.mL of 1.50 × 10-4 M hydrochloric acid is added to 125 mL of 1.75 × 10-4 M Mg(OH)2,the resulting solution will be

Accepted Answer

A) acidic. 
B) basic 
C) neutral. 
D) It is impossible to tell from the information given. 
A) acidic. 
B) basic 
C) neutral. 
D) It is impossible to tell from the information given.

Question 16

How many milliliters of a 9.0 M H2SO4 solution are needed to make 0.35 L of a 3.5 M solution?

Accepted Answer

A) 0)14 mL 
B) 0)90 mL 
C) 140 mL 
D) 900 mL 
A) 0)14 mL 
B) 0)90 mL 
C) 140 mL 
D) 900 mL

Question 17

Reaction of A (unshaded spheres)with B2 (shaded spheres)is shown schematically in the following diagram.Which equation best describes the stoichiometry of the reaction?

Accepted Answer

A) 4 A + B2 → 8 A2B 
B) 4 A + B2 → A4B2 
C) 16 A + 4 B2 → 8 A2B 
D) 16 A + 4 B2 → 4 A4B2 
A) 4 A + B2 → 8 A2B 
B) 4 A + B2 → A4B2 
C) 16 A + 4 B2 → 8 A2B 
D) 16 A + 4 B2 → 4 A4B2

Question 18

Ozone reacts with iodide ion as shown in the balanced equation below.
O3 + 2 I- + H2O → O2 + I2 + 2 OH-
In this reaction,how many grams of dioxygen can be formed from the reaction of 96 grams of ozone?

Accepted Answer

Question 19

What is the molar mass of fluorine gas?

Accepted Answer

A) 19.0 g/mol 
B) 38.0 g/mol 
C) 6)02 × 1023 g/mol 
D) 1)20 × 1023 g/mol 
A) 19.0 g/mol 
B) 38.0 g/mol 
C) 6)02 × 1023 g/mol 
D) 1)20 × 1023 g/mol

Question 20

Dinitrogen monoxide gas decomposes to form nitrogen gas and oxygen gas.How many grams of oxygen are formed when 10.0 g of dinitrogen monoxide decomposes?

Accepted Answer

A) 0)275 g 
B) 3)64 g 
C) 7)27 g 
D) 14.5 g 
A) 0)275 g 
B) 3)64 g 
C) 7)27 g 
D) 14.5 g

Exam 3: Formulas, equations, and Moles

What is the empirical formula of benzene,C6H6?

When 31.2 mL of 0.500 M AgNO3 is added to 25.0 mL of 0.300 M NH4Cl,how many grams of AgCl are formed? AgNO3(aq)+ NH4Cl(aq)→ AgCl(s)+ NH4NO3(aq)

How many cations are there in 10.0 g of sodium phosphate?

If the density of ethanol,C2H5OH,is 0.789 g/mL.How many milliliters of ethanol are needed to produce 15.0 g of CO2 according to the following chemical equation? C2H5OH(l)+ 3 O2(g)→ 2 CO2(g)+ 3 H2O(l)

Combustion analysis of a 0.675 g sample of an unknown compound that contains only carbon,hydrogen,and oxygen gives 0.627 g of CO2 and 1.534 g of H2O.The molecular mass of the unknown is

Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 30.0 g of aluminum. _____ Al(s)+ _____ I2(s)→ _____ Al2I6(s)

How many milliliters of 0.550 M hydriodic acid are needed to react with 25.00 mL of 0.217 M CsOH? HI(aq)+ CsOH(aq)→ CsI(aq)+ H2O(l)

Which one of the following statements about balanced equations is true? A reaction is balanced by

If 100.mL of 0.100 M Na2SO4 is added to 200.mL of 0.150 M NaCl,what is the concentration of Na+ ions in the final solution? Assume that the volumes are additive.

If unshaded spheres represent nitrogen atoms and shaded spheres represent oxygen atoms,which box represents reactants and which represents products for the reaction 2 NO2(g)→ 2 NO(g)+ O2 (g)?

What is the molar mass of 1-butene if 5.38 × 1016 molecules of 1-butene weigh 5.00 μg?

Which of the following has the greatest mass?

How many grams of AgNO3 are needed to make 250.mL of a solution that is 0.135 M?

How many grams of the excess reagent are left over when 6.00 g of CS2 gas react with 10.0 g of Cl2 gas in the following reaction: CS2(g)+ 3 Cl2(g)→ CCl4(l)+ S2Cl2(l)

When 280.mL of 1.50 × 10-4 M hydrochloric acid is added to 125 mL of 1.75 × 10-4 M Mg(OH)2,the resulting solution will be

How many milliliters of a 9.0 M H2SO4 solution are needed to make 0.35 L of a 3.5 M solution?

Reaction of A (unshaded spheres)with B2 (shaded spheres)is shown schematically in the following diagram.Which equation best describes the stoichiometry of the reaction?

Ozone reacts with iodide ion as shown in the balanced equation below. O3 + 2 I- + H2O → O2 + I2 + 2 OH- In this reaction,how many grams of dioxygen can be formed from the reaction of 96 grams of ozone?

What is the molar mass of fluorine gas?

Dinitrogen monoxide gas decomposes to form nitrogen gas and oxygen gas.How many grams of oxygen are formed when 10.0 g of dinitrogen monoxide decomposes?

Chemistry: Matter and Measurement

Atoms, molecules, and Ions

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Covalent Bonds and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids,solids,and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

Nuclear Chemistry

Organic and Biological Chemistry

Filters

What is the empirical formula of benzene,C₆H₆?

When 31.2 mL of 0.500 M AgNO₃ is added to 25.0 mL of 0.300 M NH₄Cl,how many grams of AgCl are formed? AgNO₃(aq)+ NH₄Cl(aq)→ AgCl(s)+ NH₄NO₃(aq)

If the density of ethanol,C₂H₅OH,is 0.789 g/mL.How many milliliters of ethanol are needed to produce 15.0 g of CO₂ according to the following chemical equation? C₂H₅OH(l)+ 3 O₂(g)→ 2 CO₂(g)+ 3 H₂O(l)

Combustion analysis of a 0.675 g sample of an unknown compound that contains only carbon,hydrogen,and oxygen gives 0.627 g of CO₂ and 1.534 g of H₂O.The molecular mass of the unknown is

Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 30.0 g of aluminum. ___ Al(s)+ _ I₂(s)→ ___ Al₂I₆(s)

How many milliliters of 0.550 M hydriodic acid are needed to react with 25.00 mL of 0.217 M CsOH? HI(aq)+ CsOH(aq)→ CsI(aq)+ H₂O(l)

If 100.mL of 0.100 M Na₂SO₄ is added to 200.mL of 0.150 M NaCl,what is the concentration of Na⁺ ions in the final solution? Assume that the volumes are additive.

If unshaded spheres represent nitrogen atoms and shaded spheres represent oxygen atoms,which box represents reactants and which represents products for the reaction 2 NO₂(g)→ 2 NO(g)+ O₂ (g)?

What is the molar mass of 1-butene if 5.38 × 10¹⁶ molecules of 1-butene weigh 5.00 μg?

How many grams of AgNO₃ are needed to make 250.mL of a solution that is 0.135 M?

How many grams of the excess reagent are left over when 6.00 g of CS₂ gas react with 10.0 g of Cl₂ gas in the following reaction: CS₂(g)+ 3 Cl₂(g)→ CCl₄(l)+ S₂Cl₂(l)

When 280.mL of 1.50 × 10^-4M hydrochloric acid is added to 125 mL of 1.75 × 10^-4 M Mg(OH)₂,the resulting solution will be

How many milliliters of a 9.0 M H₂SO₄ solution are needed to make 0.35 L of a 3.5 M solution?

Reaction of A (unshaded spheres)with B₂ (shaded spheres)is shown schematically in the following diagram.Which equation best describes the stoichiometry of the reaction?

Ozone reacts with iodide ion as shown in the balanced equation below. O₃ + 2 I^- + H₂O → O₂ + I₂ + 2 OH^- In this reaction,how many grams of dioxygen can be formed from the reaction of 96 grams of ozone?