Question 1

Balance the following equation:
Ca3(PO4)2(s)+ SiO2(s)+ C(s) $\to$ CaSiO3(s)+ CO(g)+ P4(s)

Accepted Answer

A) Ca3(PO4)2(s)+ 3SiO2(s)+ 8C(s) $\to$3CaSiO3(s)+ 8CO(g)+ P4(s) 
B) Ca3(PO4)2(s)+ 3SiO2(s)+ 14C(s) $\to$ 3CaSiO3(s)+ 14CO(g)+ P4(s) 
C) Ca3(PO4)2(s)+ 3SiO2(s)+ 8C(s) $\to$ 3CaSiO3(s)+ 8CO(g)+ 2P4(s) 
D) 2Ca3(PO4)2(s)+ 6SiO2(s)+ 10C(s) $\to$ 6CaSiO3(s)+ 10CO(g)+ P4(s) 
E) 2Ca3(PO4)2(s)+ 6SiO2(s)+ 10C(s) $\to$ 6CaSiO3(s)+ 10CO(g)+ 4P4(s) 
A) Ca3(PO4)2(s)+ 3SiO2(s)+ 8C(s) $\to$3CaSiO3(s)+ 8CO(g)+ P4(s) 
B) Ca3(PO4)2(s)+ 3SiO2(s)+ 14C(s) $\to$ 3CaSiO3(s)+ 14CO(g)+ P4(s) 
C) Ca3(PO4)2(s)+ 3SiO2(s)+ 8C(s) $\to$ 3CaSiO3(s)+ 8CO(g)+ 2P4(s) 
D) 2Ca3(PO4)2(s)+ 6SiO2(s)+ 10C(s) $\to$ 6CaSiO3(s)+ 10CO(g)+ P4(s) 
E) 2Ca3(PO4)2(s)+ 6SiO2(s)+ 10C(s) $\to$ 6CaSiO3(s)+ 10CO(g)+ 4P4(s) D

Question 2

Balance the equation
B2O3(s)+ NaOH(aq) $\to$ Na3BO3(aq)+ H2O(l)

Accepted Answer

B₂O₃(s)+ 6NaOH(aq) $\to$ 2Na₃BO₃(aq)+ 3H₂O(l)

Question 3

Potassium chloride is used as a substitute for sodium chloride for individuals with high blood pressure.Identify the limiting reactant and determine the mass of the excess reactant remaining when 7.00 g of chlorine gas reacts with 5.00 g of potassium to form potassium chloride.

Accepted Answer

A) Potassium is the limiting reactant;2.47 g of chlorine remain. 
B) Potassium is the limiting reactant;7.23 g of chlorine remain. 
C) Chlorine is the limiting reactant;4.64 g of potassium remain. 
D) Chlorine is the limiting reactant;2.70 g of potassium remain. 
E) No limiting reagent: the reactants are present in the correct stoichiometric ratio. 
A) Potassium is the limiting reactant;2.47 g of chlorine remain. 
B) Potassium is the limiting reactant;7.23 g of chlorine remain. 
C) Chlorine is the limiting reactant;4.64 g of potassium remain. 
D) Chlorine is the limiting reactant;2.70 g of potassium remain. 
E) No limiting reagent: the reactants are present in the correct stoichiometric ratio. A

Question 4

Aluminum metal dissolved in hydrochloric acid as follows:
2Al(s)+ 6HCl(aq) $\to$ 2AlCl3(aq)+ 3H2(g)
a.What is the minimum volume of 6.0 M HCl(aq)needed to completely dissolve 3.20 g of aluminum in this reaction?
b.What mass of AlCl3 would be produced by complete reaction of 3.20 g of aluminum?

Accepted Answer

The answer of Aluminum metal dissolved in hydrochloric acid as...

Question 5

Sodium bromate is used in a mixture which dissolves gold from its ores.Calculate the mass in grams of 4.68 mol of sodium bromate.

Accepted Answer

A) 706 g 
B) 482 g 
C) 383 g 
D) 32.2 g 
E) 0.0310 g 
A) 706 g 
B) 482 g 
C) 383 g 
D) 32.2 g 
E) 0.0310 g

Question 6

Ammonia,NH3 ,is produced industrially from nitrogen and hydrogen as follows:
N2(g)+ 3H2(g) $\to$  2NH3(g)
What mass,of which starting material,will remain when 30.0 g of N2 and 10.0 g of H2 react until the limiting reagent is completely consumed?

Accepted Answer

3.52 g of

Question 7

Calculate the molar mass of rubidium carbonate,Rb2CO3.

Accepted Answer

A) 340.43 g/mol 
B) 255.00 g/mol 
C) 230.94 g/mol 
D) 145.47 g/mol 
E) 113.48 g/mol 
A) 340.43 g/mol 
B) 255.00 g/mol 
C) 230.94 g/mol 
D) 145.47 g/mol 
E) 113.48 g/mol

Question 8

A compound containing chromium and silicon contains 73.52 mass percent chromium.Determine its empirical formula.

Accepted Answer

A) CrSi3 
B) Cr2Si3 
C) Cr3Si 
D) Cr3Si2 
E) Cr2S 
A) CrSi3 
B) Cr2Si3 
C) Cr3Si 
D) Cr3Si2 
E) Cr2S

Question 9

Aluminum sulfate,Al2(SO4)3,is used in tanning leather,purifying water,and manufacture of antiperspirants.Calculate its molar mass.

Accepted Answer

A) 450.06 g/mol 
B) 342.15 g/mol 
C) 315.15 g/mol 
D) 278.02 g/mol 
E) 74.98 g/mol 
A) 450.06 g/mol 
B) 342.15 g/mol 
C) 315.15 g/mol 
D) 278.02 g/mol 
E) 74.98 g/mol

Question 10

Balance the following equation for the combustion of benzene:
C6H6(l)+ O2(g) $\to$ H2O(g)+ CO2(g)

Accepted Answer

A) C6H6(l)+ 9O2(g) $\to$ 3H2O(g)+ 6CO2(g) 
B) C6H6(l)+ 9O2(g) $\to$ 6H2O(g)+ 6CO2(g) 
C) 2C6H6(l)+ 15O2(g) $\to$6H2O(g)+ 12CO2(g) 
D) C6H6(l)+ 15O2(g) $\to$ 3H2O(g)+ 6CO2(g) 
E) 2C6H6(l)+ 9O2(g) $\to$6H2O(g)+ 12CO2(g) 
A) C6H6(l)+ 9O2(g) $\to$ 3H2O(g)+ 6CO2(g) 
B) C6H6(l)+ 9O2(g) $\to$ 6H2O(g)+ 6CO2(g) 
C) 2C6H6(l)+ 15O2(g) $\to$6H2O(g)+ 12CO2(g) 
D) C6H6(l)+ 15O2(g) $\to$ 3H2O(g)+ 6CO2(g) 
E) 2C6H6(l)+ 9O2(g) $\to$6H2O(g)+ 12CO2(g)

Question 11

Copper(II)sulfide,CuS,is used in the development of aniline black dye in textile printing.What is the maximum mass of CuS which can be formed when 38.0 mL of 0.500 M CuCl2 are mixed with 42.0 mL of 0.600 M (NH4)2S? Aqueous ammonium chloride is the other product.

Accepted Answer

A) 2.41 g 
B) 1.82 g 
C) 1.21 g 
D) 0.909 g 
E) 0.044 g 
A) 2.41 g 
B) 1.82 g 
C) 1.21 g 
D) 0.909 g 
E) 0.044 g

Question 12

What is the mass in grams of 0.250 mol of the common antacid calcium carbonate?

Accepted Answer

A) 4.00 $\times$ 102 g 
B) 25.0 g 
C) 17.0 g 
D) 4.00 $\times$ 10-2 g 
E) 2.50 $\times$ 10-3 g 
A) 4.00 $\times$ 102 g 
B) 25.0 g 
C) 17.0 g 
D) 4.00 $\times$ 10-2 g 
E) 2.50 $\times$ 10-3 g

Question 13

A solution of methanol (CH4O)in water has a concentration of 0.200 M.What mass of methanol,in grams,is present in 0.150 liters of this solution?

Accepted Answer

Question 14

Aluminum reacts with oxygen to produce aluminum oxide which can be used as an adsorbent,desiccant or catalyst for organic reactions.
4Al(s)+ 3O2(g) $\to$ 2Al2O3(s)
A mixture of 82.49 g of aluminum (  
= 26.98 g/mol)and 117.65 g of oxygen (  
= 32.00 g/mol)is allowed to react.Identify the limiting reactant and determine the mass of the excess reactant present in the vessel when the reaction is complete.

Accepted Answer

A) Oxygen is the limiting reactant;19.81 g of aluminum remain. 
B) Oxygen is the limiting reactant;35.16 g of aluminum remain. 
C) Aluminum is the limiting reactant;16.70 g of oxygen remain. 
D) Aluminum is the limiting reactant;35.16 g of oxygen remain. 
E) Aluminum is the limiting reactant;44.24 g of oxygen remain. 
A) Oxygen is the limiting reactant;19.81 g of aluminum remain. 
B) Oxygen is the limiting reactant;35.16 g of aluminum remain. 
C) Aluminum is the limiting reactant;16.70 g of oxygen remain. 
D) Aluminum is the limiting reactant;35.16 g of oxygen remain. 
E) Aluminum is the limiting reactant;44.24 g of oxygen remain.

Question 15

A 0.150 M sodium chloride solution is referred to as a physiological saline solution because it has the same concentration of salts as normal human blood.Calculate the mass of solute needed to prepare 275.0 mL of a physiological saline solution.

Accepted Answer

A) 41.3 g 
B) 31.9 g 
C) 16.1 g 
D) 8.77 g 
E) 2.41 g 
A) 41.3 g 
B) 31.9 g 
C) 16.1 g 
D) 8.77 g 
E) 2.41 g

Question 16

Sodium chlorate is used as an oxidizer in the manufacture of dyes,explosives and matches.Calculate the mass of solute needed to prepare 1.575 L of 0.00250 M NaClO3 (  
= 106.45 g/mol).

Accepted Answer

A) 419 g 
B) 169 g 
C) 0.419 g 
D) 0.169 g 
E) 0.00394 g 
A) 419 g 
B) 169 g 
C) 0.419 g 
D) 0.169 g 
E) 0.00394 g

Question 17

Hydrochloric acid is widely used as a laboratory reagent,in refining ore for the production of tin and tantalum,and as a catalyst in organic reactions.Calculate the number of moles of HCl in 62.85 mL of 0.453 M hydrochloric acid.

Accepted Answer

A) 28.5 mol 
B) 1.04 mol 
C) 0.139 mol 
D) 0.0285 mol 
E) 0.00721 mol 
A) 28.5 mol 
B) 1.04 mol 
C) 0.139 mol 
D) 0.0285 mol 
E) 0.00721 mol

Question 18

Calculate the mass in grams of 8.35 $\times$ 1022 molecules of CBr4.

Accepted Answer

A) 0.0217 g 
B) 0.139 g 
C) 7.21 g 
D) 12.7 g 
E) 46.0 g 
A) 0.0217 g 
B) 0.139 g 
C) 7.21 g 
D) 12.7 g 
E) 46.0 g

Question 19

How many grams of sodium fluoride (used in water fluoridation and manufacture of insecticides)are needed to form 485 g of sulfur tetrafluoride?
3SCl2(l)+ 4NaF(s) $\to$ SF4(g)+ S2Cl2(l)+ 4NaCl(s)

Accepted Answer

A) 1940 g 
B) 1510 g 
C) 754 g 
D) 205 g 
E) 51.3 g 
A) 1940 g 
B) 1510 g 
C) 754 g 
D) 205 g 
E) 51.3 g

Question 20

Ammonia,an important source of fixed nitrogen that can be metabolized by plants,is produced using the Haber process in which nitrogen and hydrogen combine.
N2(g)+ 3H2(g) $\to$2NH3(g)
How many grams of nitrogen are needed to produce 325 grams of ammonia?

Accepted Answer

A) 1070 g 
B) 535 g 
C) 267 g 
D) 178 g 
E) 108 g 
A) 1070 g 
B) 535 g 
C) 267 g 
D) 178 g 
E) 108 g

Exam 3: Stoichiometry of Formulas and Equations

Balance the following equation: Ca3(PO4)2(s)+ SiO2(s)+ C(s) →\to→ CaSiO3(s)+ CO(g)+ P4(s)

Balance the equation B2O3(s)+ NaOH(aq) →\to→ Na3BO3(aq)+ H2O(l)

Potassium chloride is used as a substitute for sodium chloride for individuals with high blood pressure.Identify the limiting reactant and determine the mass of the excess reactant remaining when 7.00 g of chlorine gas reacts with 5.00 g of potassium to form potassium chloride.

Aluminum metal dissolved in hydrochloric acid as follows: 2Al(s)+ 6HCl(aq) →\to→ 2AlCl3(aq)+ 3H2(g) a.What is the minimum volume of 6.0 M HCl(aq)needed to completely dissolve 3.20 g of aluminum in this reaction? b.What mass of AlCl3 would be produced by complete reaction of 3.20 g of aluminum?

Sodium bromate is used in a mixture which dissolves gold from its ores.Calculate the mass in grams of 4.68 mol of sodium bromate.

Ammonia,NH3 ,is produced industrially from nitrogen and hydrogen as follows: N2(g)+ 3H2(g) →\to→ 2NH3(g) What mass,of which starting material,will remain when 30.0 g of N2 and 10.0 g of H2 react until the limiting reagent is completely consumed?

Calculate the molar mass of rubidium carbonate,Rb2CO3.

A compound containing chromium and silicon contains 73.52 mass percent chromium.Determine its empirical formula.

Aluminum sulfate,Al2(SO4)3,is used in tanning leather,purifying water,and manufacture of antiperspirants.Calculate its molar mass.

Balance the following equation for the combustion of benzene: C6H6(l)+ O2(g) →\to→ H2O(g)+ CO2(g)

Copper(II)sulfide,CuS,is used in the development of aniline black dye in textile printing.What is the maximum mass of CuS which can be formed when 38.0 mL of 0.500 M CuCl2 are mixed with 42.0 mL of 0.600 M (NH4)2S? Aqueous ammonium chloride is the other product.

What is the mass in grams of 0.250 mol of the common antacid calcium carbonate?

A solution of methanol (CH4O)in water has a concentration of 0.200 M.What mass of methanol,in grams,is present in 0.150 liters of this solution?

A 0.150 M sodium chloride solution is referred to as a physiological saline solution because it has the same concentration of salts as normal human blood.Calculate the mass of solute needed to prepare 275.0 mL of a physiological saline solution.

Sodium chlorate is used as an oxidizer in the manufacture of dyes,explosives and matches.Calculate the mass of solute needed to prepare 1.575 L of 0.00250 M NaClO3 ( = 106.45 g/mol).

Hydrochloric acid is widely used as a laboratory reagent,in refining ore for the production of tin and tantalum,and as a catalyst in organic reactions.Calculate the number of moles of HCl in 62.85 mL of 0.453 M hydrochloric acid.

Calculate the mass in grams of 8.35 ×\times× 1022 molecules of CBr4.

How many grams of sodium fluoride (used in water fluoridation and manufacture of insecticides)are needed to form 485 g of sulfur tetrafluoride? 3SCl2(l)+ 4NaF(s) →\to→ SF4(g)+ S2Cl2(l)+ 4NaCl(s)

Ammonia,an important source of fixed nitrogen that can be metabolized by plants,is produced using the Haber process in which nitrogen and hydrogen combine. N2(g)+ 3H2(g) →\to→ 2NH3(g) How many grams of nitrogen are needed to produce 325 grams of ammonia?

Keys to the Study of Chemistry

The Components of Matter

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids,solids,and Phase Changes

The Properties of Solutions

The Main-Group Elements: Applying Principles of Bonding and Structure

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Balance the following equation: Ca₃(PO₄)₂(s)+ SiO₂(s)+ C(s) $\to$ CaSiO₃(s)+ CO(g)+ P₄(s)

Balance the equation B₂O₃(s)+ NaOH(aq) $\to$ Na₃BO₃(aq)+ H₂O(l)

Ammonia,NH₃ ,is produced industrially from nitrogen and hydrogen as follows: N₂(g)+ 3H₂(g) $\to$ 2NH₃(g) What mass,of which starting material,will remain when 30.0 g of N₂ and 10.0 g of H₂ react until the limiting reagent is completely consumed?

Calculate the molar mass of rubidium carbonate,Rb₂CO₃.

Aluminum sulfate,Al₂(SO₄)₃,is used in tanning leather,purifying water,and manufacture of antiperspirants.Calculate its molar mass.

Balance the following equation for the combustion of benzene: C₆H₆(l)+ O₂(g) $\to$ H₂O(g)+ CO₂(g)

Copper(II)sulfide,CuS,is used in the development of aniline black dye in textile printing.What is the maximum mass of CuS which can be formed when 38.0 mL of 0.500 M CuCl₂ are mixed with 42.0 mL of 0.600 M (NH₄)₂S? Aqueous ammonium chloride is the other product.

A solution of methanol (CH₄O)in water has a concentration of 0.200 M.What mass of methanol,in grams,is present in 0.150 liters of this solution?

Sodium chlorate is used as an oxidizer in the manufacture of dyes,explosives and matches.Calculate the mass of solute needed to prepare 1.575 L of 0.00250 M NaClO₃ ( = 106.45 g/mol).

Calculate the mass in grams of 8.35 $\times$ 10²² molecules of CBr₄.

How many grams of sodium fluoride (used in water fluoridation and manufacture of insecticides)are needed to form 485 g of sulfur tetrafluoride? 3SCl₂(l)+ 4NaF(s) $\to$ SF₄(g)+ S₂Cl₂(l)+ 4NaCl(s)

Ammonia,an important source of fixed nitrogen that can be metabolized by plants,is produced using the Haber process in which nitrogen and hydrogen combine. N₂(g)+ 3H₂(g) $\to$ 2NH₃(g) How many grams of nitrogen are needed to produce 325 grams of ammonia?