Question 1

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

Accepted Answer

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

Question 2

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/molF) All of the above
G) None of the above

Question 3

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 gF) C) and D)
G) All of the above

Question 4

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 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 gF) A) and C)
G) A) and B)

Question 6

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

Accepted Answer

A)  C6H6(l) + 9O2(g)   →	o→  3H2O(g) + 6CO2(g) 
B)  C6H6(l) + 9O2(g)   →	o→  6H2O(g) + 6CO2(g) 
C)  2C6H6(l) + 15O2(g)   →	o→ 6H2O(g) + 12CO2(g) 
D)  C6H6(l) + 15O2(g)   →	o→  3H2O(g) + 6CO2(g) 
E)  2C6H6(l) + 9O2(g)   →	o→ 6H2O(g) + 12CO2(g)  F) All of the above
G) A) and B)

Question 7

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 8

Calculate the mass in grams of 8.35  ×	imes×  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 F) A) and D)
G) B) and C)

Question 9

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

Accepted Answer

A)  4.00  ×	imes×  102 g
B)  25.0 g
C)  17.0 g
D)  4.00  ×	imes×  10-2 g
E)  2.50  ×	imes×  10-3 g F) C) and D)
G) D) and E)

Question 10

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)   →	o→  SF4(g) + S2Cl2(l) + 4NaCl(s)

Accepted Answer

A)  1940 g
B)  1510 g
C)  754 g
D)  205 g
E)  51.3 g F) All of the above
G) B) and C)

Question 11

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 molF) B) and E)
G) C) and D)

Question 12

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/molF) A) and B)
G) All of the above

Question 13

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 14

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 ( 3 (   = 106.45 g/mol) . A) 419 g B) 169 g C) 0.419 g D) 0.169 g E) 0.00394 g" class="answers-bank-image d-inline" rel="preload" >
= 106.45 g/mol) .

Accepted Answer

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

Question 15

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)   →	o→ 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 F) D) and E)
G) A) and B)

Question 16

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

Accepted Answer

A)  Ca3(PO4) 2(s) + 3SiO2(s) + 8C(s)   →	o→ 3CaSiO3(s) + 8CO(g) + P4(s) 
B)  Ca3(PO4) 2(s) + 3SiO2(s) + 14C(s)   →	o→  3CaSiO3(s) + 14CO(g) + P4(s) 
C)  Ca3(PO4) 2(s) + 3SiO2(s) + 8C(s)   →	o→  3CaSiO3(s) + 8CO(g) + 2P4(s) 
D)  2Ca3(PO4) 2(s) + 6SiO2(s) + 10C(s)   →	o→  6CaSiO3(s) + 10CO(g) + P4(s) 
E)  2Ca3(PO4) 2(s) + 6SiO2(s) + 10C(s)   →	o→  6CaSiO3(s) + 10CO(g) + 4P4(s)  F) A) and B)
G) B) and C) D

Question 17

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)  Cr2SF) A) and D)
G) All of the above

Question 18

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)   →	o→  2Al2O3(s) 
A mixture of 82.49 g of aluminum ( 2(g)   	o  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. 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. " class="answers-bank-image d-inline" rel="preload" >
= 26.98 g/mol) and 117.65 g of oxygen ( 2(g)   	o  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. 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. " class="answers-bank-image d-inline" rel="preload" >
= 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. F) A) and B)
G) B) and D)

Question 19

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.F) None of the above
G) B) and E) A

Question 20

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 gF) B) and E)
G) A) and B)

Exam 3: Stoichiometry of Formulas and Equations

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

Correct Answer
verified
B₂O₃(s)+ 6NaOH(aq) \(\to\) 2Na₃BO₃(aq)+ 3H₂O(l)

Calculate the molar mass of rubidium carbonate,Rb₂CO₃.

Correct Answer
verified

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.

Correct Answer
verified

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?

Correct Answer
verified

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.

Correct Answer
verified

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

Correct Answer
verified

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?

Correct Answer
verified
3.52 g of ...
View Answer

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

Correct Answer
verified

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

Correct Answer
verified

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)

Correct Answer
verified

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.

Correct Answer
verified

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

Correct Answer
verified

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?

Correct Answer
verified

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) .

Correct Answer
verified

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?

Correct Answer
verified

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

Correct Answer
verified
D

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

Correct Answer
verified

Correct Answer
verified

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.

Correct Answer
verified
A

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.

Correct Answer
verified

Exam 3: Stoichiometry of Formulas and Equations

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

Correct AnswerverifiedB2O3(s)+ 6NaOH(aq) \(\to\) 2Na3BO3(aq)+ 3H2O(l)

Calculate the molar mass of rubidium carbonate,Rb2CO3.

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct Answerverified3.52 g of ...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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)

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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) .

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedD

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedA

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.

Correct AnswerverifiedShow Answer

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

Correct Answer
verified
B₂O₃(s)+ 6NaOH(aq) \(\to\) 2Na₃BO₃(aq)+ 3H₂O(l)

Calculate the molar mass of rubidium carbonate,Rb₂CO₃.

Correct Answer
verified

Correct Answer
verified

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?

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

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?

Correct Answer
verified
3.52 g of ...
View Answer

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

Correct Answer
verified

Correct Answer
verified

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)

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

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) .

Correct Answer
verified

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?

Correct Answer
verified

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

Correct Answer
verified
D

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A

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.

Correct Answer
verified