Question 1

Potassium dichromate,K2Cr2O7,is used in tanning leather,decorating porcelain and waterproofing fabrics.Calculate the number of chromium atoms in 78.82 g of K2Cr2O7.

Accepted Answer

A)  9.490  ×	imes×  1025 Cr atoms
B)  2.248  ×	imes×  1024 Cr atoms
C)  1.124  ×	imes×  1024 Cr atoms
D)  3.227  ×	imes×  1023 Cr atoms
E)  1.613  ×	imes×  1023 Cr atoms F) B) and D)
G) A) and B)

Question 2

Potassium chlorate (used in fireworks,flares and safety matches) forms oxygen and potassium chloride when heated.
KClO3(s)   →	o→  KCl(s) + O2(g) [unbalanced]
How many grams of oxygen are formed when 26.4 g of potassium chlorate is heated?

Accepted Answer

A)  223 g
B)  99.1 g
C)  10.3 g
D)  6.86 g
E)  4.60 g F) A) and B)
G) All of the above

Question 3

The insecticide DDT was formerly in widespread use,but now it is severely restricted owing to its adverse environmental effects.It is prepared as follows:
  
If 10.00 g of chloral were reacted with 10.00 g of chlorobenzene,
a.what is the maximum amount (mol)of DDT which could be formed?
b.what is the limiting reagent?
c.what is the % yield,if 12.15 g of DDT is produced?

Accepted Answer

a.0.0444 mol DDT
b.C...

Question 4

Balance the following equation:
UO2(s) + HF(l)   →	o→  UF4(s) + H2O(l)

Accepted Answer

A)  UO2(s) + 2HF(l)   →	o→  UF4(s) + H2O(l) 
B)  UO2(s) + 4HF(l)   →	o→  UF4(s) + 2H2O(l) 
C)  UO2 (s) + H4F4(l)   →	o→ UF4 (s) + H4O2(l) 
D)  UO2(s) + 4HF(l)   →	o→  UF4(s) + 4H2O(l) 
E)  UO2(s) + 8HF(l)   →	o→  2UF4(s) + 4H2O(l)  F) B) and D)
G) C) and D)

Question 5

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide,Mg(OH) 2.

Accepted Answer

A)  3.28 mol
B)  2.32 mol
C)  0.431 mol
D)  0.305 mol
E)  0.200 molF) C) and D)
G) None of the above

Question 6

Aluminum metal reacts with chlorine gas to form solid aluminum trichloride,AlCl3.What mass of chlorine gas is needed to react completely with 163 g of aluminum?

Accepted Answer

A)  214 g
B)  245 g
C)  321 g
D)  489 g
E)  643 gF) B) and E)
G) All of the above

Question 7

What is the percent yield for the reaction
PCl3(g) + Cl2(g)   →	o→  PCl5(g) 
If 119.3 g of PCl5 ( 3(g) + Cl2(g)   	o  PCl5(g)  If 119.3 g of PCl5 (   = 208.2 g/mol) are formed when 61.3 g of Cl2 (   = 70.91 g/mol) react with excess PCl3? A) 195% B) 85.0% C) 66.3% D) 51.4% E) 43.7% " class="answers-bank-image d-inline" rel="preload" >
= 208.2 g/mol) are formed when 61.3 g of Cl2 ( 3(g) + Cl2(g)   	o  PCl5(g)  If 119.3 g of PCl5 (   = 208.2 g/mol) are formed when 61.3 g of Cl2 (   = 70.91 g/mol) react with excess PCl3? A) 195% B) 85.0% C) 66.3% D) 51.4% E) 43.7% " class="answers-bank-image d-inline" rel="preload" >
= 70.91 g/mol) react with excess PCl3?

Accepted Answer

A)  195%
B)  85.0%
C)  66.3%
D)  51.4%
E)  43.7% F) B) and E)
G) B) and C)

Question 8

In the combustion analysis of 0.1127 g of glucose (C6H12O6) ,what mass,in grams,of CO2 would be produced?

Accepted Answer

A)  0.0451 g
B)  0.0825 g
C)  0.1652 g
D)  0.4132 g
E)  1.466 gF) B) and D)
G) None of the above

Question 9

Balance the following equation for the combustion of butane,a hydrocarbon used in gas lighters:
C4H10(g)+ O2(g) $\to$ CO2(g)+ H2O(l)

Accepted Answer

2C<sub>4</sub>H<sub>...

Question 10

Calcium chloride is used to melt ice and snow on roads and sidewalks and to remove water from organic liquids.Calculate the molarity of a solution prepared by diluting 165 mL of 0.688 M calcium chloride to 925.0 mL.

Accepted Answer

A)  3.86 M
B)  0.743 M
C)  0.222 M
D)  0.123 M
E)  0.114 MF) A) and B)
G) C) and E)

Question 11

Ammonia will react with fluorine to produce dinitrogen tetrafluoride and hydrogen fluoride (used in production of aluminum,in uranium processing,and in frosting of light bulbs) .
2NH3(g) + 5F2(g)   →	o→ N2F4(g) + 6HF(g) 
How many moles of NH3 are needed to react completely with 13.6 mol of F2?

Accepted Answer

A)  34.0 mol
B)  27.2 mol
C)  6.80 mol
D)  5.44 mol
E)  2.27 mol F) C) and E)
G) C) and D)

Question 12

Propane,C3H8,is commonly provided as a bottled gas for use as a fuel.In 0.200 mol of propane,

Accepted Answer

A)  what is the mass of propane?
B)  7.21 g
C)  1.20  ×	imes×  1023 C3H8 molecules
D)  9.64  ×	imes×  1023 H atoms E) All of the above
F) A) and B)

Question 13

Calculate the number of oxygen atoms in 29.34 g of sodium sulfate,Na2SO4.

Accepted Answer

A)  1.244  ×	imes×  1023 O atoms
B)  4.976  ×	imes×  1023 O atoms
C)  2.409  ×	imes×  1024 O atoms
D)  2.915  ×	imes×  1024 O atoms
E)  1.166  ×	imes×  1025 O atoms F) A) and E)
G) C) and E)

Question 14

Balance the following equation for partial oxidation of ammonia,an important reaction in the production of nitric acid:
NH3(g)+ O2(g) $\to$  NO(g)+ H2O(l)

Accepted Answer

4NH₃(g)+ ...

Question 15

A compound consisting of C,H and O only,has a molar mass of 331.5 g/mol.Combustion of 0.1000 g of this compound caused a 0.2921 g increase in the mass of the CO2 absorber and a 0.0951 g increase in the mass of the H2O absorber.What is the empirical formula of the compound?

Accepted Answer

Question 16

Lithium hydroxide is used in alkaline batteries.Calculate the molarity of a solution prepared by dissolving 1.495 moles of LiOH in enough water to give a final volume of 750.mL.

Accepted Answer

A)  1.99 M
B)  1.50 M
C)  1.12 M
D)  0.502 M
E)  0.00199 MF) C) and D)
G) B) and C)

Question 17

How many grams of oxygen are needed to react completely with 200.0 g of ammonia,NH3?
4NH3(g) + 5O2(g)   →	o→  4NO(g) + 6H2O(g)

Accepted Answer

A)  469.7 g
B)  300.6 g
C)  250.0 g
D)  3.406 g
E)  2.180 g F) All of the above
G) D) and E)

Question 18

In combustion analysis,the carbon and hydrogen contents of a substance are determined from the CO2 and H2O,respectively,which are collected in the absorbers.

Accepted Answer

A) True 
 B)False

Question 19

Calculate the molarity of a 23.55-mL solution which contains 28.24 mg of sodium sulfate (used in dyeing and printing textiles, 
= 139.04 g/mol) .

Accepted Answer

A)  8.625 M
B)  1.199 M
C)  0.8339 M
D)  0.2031 M
E)  0.008625 MF) A) and B)
G) A) and C)

Question 20

A compound of bromine and fluorine is used to make UF6,which is an important chemical in processing and reprocessing of nuclear fuel.The compound contains 58.37 mass percent bromine.Determine its empirical formula.

Accepted Answer

A)  BrF
B)  BrF2
C)  Br2F3
D)  Br3F
E)  BrF3F) A) and B)
G) A) and E)

Exam 3: Stoichiometry of Formulas and Equations

Balance the following equation for partial oxidation of ammonia,an important reaction in the production of nitric acid: NH₃(g)+ O₂(g) $\to$ NO(g)+ H₂O(l)

Correct Answer
verified
4NH₃(g)+ ...
View Answer

Correct Answer
verified
a.0.0444 mol DDT
b.C...
View Answer

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide,Mg(OH) ₂.

Correct Answer
verified

Calculate the number of oxygen atoms in 29.34 g of sodium sulfate,Na₂SO₄.

Correct Answer
verified

Correct Answer
verified

In combustion analysis,the carbon and hydrogen contents of a substance are determined from the CO₂ and H₂O,respectively,which are collected in the absorbers.

Correct Answer
verified

Correct Answer
verified

Calculate the molarity of a 23.55-mL solution which contains 28.24 mg of sodium sulfate (used in dyeing and printing textiles, = 139.04 g/mol) .

Correct Answer
verified

Lithium hydroxide is used in alkaline batteries.Calculate the molarity of a solution prepared by dissolving 1.495 moles of LiOH in enough water to give a final volume of 750.mL.

Correct Answer
verified

Balance the following equation for the combustion of butane,a hydrocarbon used in gas lighters: C₄H₁₀(g)+ O₂(g) $\to$ CO₂(g)+ H₂O(l)

Correct Answer
verified
2C₄H_...
View Answer

Aluminum metal reacts with chlorine gas to form solid aluminum trichloride,AlCl₃.What mass of chlorine gas is needed to react completely with 163 g of aluminum?

Correct Answer
verified

A compound consisting of C,H and O only,has a molar mass of 331.5 g/mol.Combustion of 0.1000 g of this compound caused a 0.2921 g increase in the mass of the CO₂ absorber and a 0.0951 g increase in the mass of the H₂O absorber.What is the empirical formula of the compound?

Correct Answer
verified

Balance the following equation: UO₂(s) + HF(l) $\to$ UF₄(s) + H₂O(l)

Correct Answer
verified

Propane,C₃H₈,is commonly provided as a bottled gas for use as a fuel.In 0.200 mol of propane,

Correct Answer
verified

Potassium dichromate,K₂Cr₂O₇,is used in tanning leather,decorating porcelain and waterproofing fabrics.Calculate the number of chromium atoms in 78.82 g of K₂Cr₂O₇.

Correct Answer
verified

Calcium chloride is used to melt ice and snow on roads and sidewalks and to remove water from organic liquids.Calculate the molarity of a solution prepared by diluting 165 mL of 0.688 M calcium chloride to 925.0 mL.

Correct Answer
verified

Potassium chlorate (used in fireworks,flares and safety matches) forms oxygen and potassium chloride when heated. KClO₃(s) $\to$ KCl(s) + O₂(g) [unbalanced] How many grams of oxygen are formed when 26.4 g of potassium chlorate is heated?

Correct Answer
verified

How many grams of oxygen are needed to react completely with 200.0 g of ammonia,NH₃? 4NH₃(g) + 5O₂(g) $\to$ 4NO(g) + 6H₂O(g)

Correct Answer
verified

In the combustion analysis of 0.1127 g of glucose (C₆H₁₂O₆) ,what mass,in grams,of CO₂ would be produced?

Correct Answer
verified

A compound of bromine and fluorine is used to make UF₆,which is an important chemical in processing and reprocessing of nuclear fuel.The compound contains 58.37 mass percent bromine.Determine its empirical formula.

Correct Answer
verified

Exam 3: Stoichiometry of Formulas and Equations

Balance the following equation for partial oxidation of ammonia,an important reaction in the production of nitric acid: NH3(g)+ O2(g) →\to→ NO(g)+ H2O(l)

Correct Answerverified4NH3(g)+ ...View AnswerShow Answer

Correct Answerverifieda.0.0444 mol DDTb.C...View AnswerShow Answer

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide,Mg(OH) 2.

Correct AnswerverifiedShow Answer

Calculate the number of oxygen atoms in 29.34 g of sodium sulfate,Na2SO4.

Correct AnswerverifiedShow Answer

What is the percent yield for the reaction PCl3(g) + Cl2(g) →\to→ PCl5(g) If 119.3 g of PCl5 ( = 208.2 g/mol) are formed when 61.3 g of Cl2 ( = 70.91 g/mol) react with excess PCl3?

Correct AnswerverifiedShow Answer

In combustion analysis,the carbon and hydrogen contents of a substance are determined from the CO2 and H2O,respectively,which are collected in the absorbers.

Correct AnswerverifiedShow Answer

Ammonia will react with fluorine to produce dinitrogen tetrafluoride and hydrogen fluoride (used in production of aluminum,in uranium processing,and in frosting of light bulbs) . 2NH3(g) + 5F2(g) →\to→ N2F4(g) + 6HF(g) How many moles of NH3 are needed to react completely with 13.6 mol of F2?

Correct AnswerverifiedShow Answer

Calculate the molarity of a 23.55-mL solution which contains 28.24 mg of sodium sulfate (used in dyeing and printing textiles, = 139.04 g/mol) .

Correct AnswerverifiedShow Answer

Lithium hydroxide is used in alkaline batteries.Calculate the molarity of a solution prepared by dissolving 1.495 moles of LiOH in enough water to give a final volume of 750.mL.

Correct AnswerverifiedShow Answer

Balance the following equation for the combustion of butane,a hydrocarbon used in gas lighters: C4H10(g)+ O2(g) →\to→ CO2(g)+ H2O(l)

Correct Answerverified2C4H...View AnswerShow Answer

Aluminum metal reacts with chlorine gas to form solid aluminum trichloride,AlCl3.What mass of chlorine gas is needed to react completely with 163 g of aluminum?

Correct AnswerverifiedShow Answer

A compound consisting of C,H and O only,has a molar mass of 331.5 g/mol.Combustion of 0.1000 g of this compound caused a 0.2921 g increase in the mass of the CO2 absorber and a 0.0951 g increase in the mass of the H2O absorber.What is the empirical formula of the compound?

Correct AnswerverifiedShow Answer

Balance the following equation: UO2(s) + HF(l) →\to→ UF4(s) + H2O(l)

Correct AnswerverifiedShow Answer

Propane,C3H8,is commonly provided as a bottled gas for use as a fuel.In 0.200 mol of propane,

Correct AnswerverifiedShow Answer

Potassium dichromate,K2Cr2O7,is used in tanning leather,decorating porcelain and waterproofing fabrics.Calculate the number of chromium atoms in 78.82 g of K2Cr2O7.

Correct AnswerverifiedShow Answer

Calcium chloride is used to melt ice and snow on roads and sidewalks and to remove water from organic liquids.Calculate the molarity of a solution prepared by diluting 165 mL of 0.688 M calcium chloride to 925.0 mL.

Correct AnswerverifiedShow Answer

Potassium chlorate (used in fireworks,flares and safety matches) forms oxygen and potassium chloride when heated. KClO3(s) →\to→ KCl(s) + O2(g) [unbalanced] How many grams of oxygen are formed when 26.4 g of potassium chlorate is heated?

Correct AnswerverifiedShow Answer

How many grams of oxygen are needed to react completely with 200.0 g of ammonia,NH3? 4NH3(g) + 5O2(g) →\to→ 4NO(g) + 6H2O(g)

Correct AnswerverifiedShow Answer

In the combustion analysis of 0.1127 g of glucose (C6H12O6) ,what mass,in grams,of CO2 would be produced?

Correct AnswerverifiedShow Answer

A compound of bromine and fluorine is used to make UF6,which is an important chemical in processing and reprocessing of nuclear fuel.The compound contains 58.37 mass percent bromine.Determine its empirical formula.

Correct AnswerverifiedShow Answer

Balance the following equation for partial oxidation of ammonia,an important reaction in the production of nitric acid: NH₃(g)+ O₂(g) $\to$ NO(g)+ H₂O(l)

Correct Answer
verified
4NH₃(g)+ ...
View Answer

Correct Answer
verified
a.0.0444 mol DDT
b.C...
View Answer

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide,Mg(OH) ₂.

Correct Answer
verified

Calculate the number of oxygen atoms in 29.34 g of sodium sulfate,Na₂SO₄.

Correct Answer
verified

Correct Answer
verified

In combustion analysis,the carbon and hydrogen contents of a substance are determined from the CO₂ and H₂O,respectively,which are collected in the absorbers.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Balance the following equation for the combustion of butane,a hydrocarbon used in gas lighters: C₄H₁₀(g)+ O₂(g) $\to$ CO₂(g)+ H₂O(l)

Correct Answer
verified
2C₄H_...
View Answer

Aluminum metal reacts with chlorine gas to form solid aluminum trichloride,AlCl₃.What mass of chlorine gas is needed to react completely with 163 g of aluminum?

Correct Answer
verified

A compound consisting of C,H and O only,has a molar mass of 331.5 g/mol.Combustion of 0.1000 g of this compound caused a 0.2921 g increase in the mass of the CO₂ absorber and a 0.0951 g increase in the mass of the H₂O absorber.What is the empirical formula of the compound?

Correct Answer
verified

Balance the following equation: UO₂(s) + HF(l) $\to$ UF₄(s) + H₂O(l)

Correct Answer
verified

Propane,C₃H₈,is commonly provided as a bottled gas for use as a fuel.In 0.200 mol of propane,

Correct Answer
verified

Potassium dichromate,K₂Cr₂O₇,is used in tanning leather,decorating porcelain and waterproofing fabrics.Calculate the number of chromium atoms in 78.82 g of K₂Cr₂O₇.

Correct Answer
verified

Correct Answer
verified

Potassium chlorate (used in fireworks,flares and safety matches) forms oxygen and potassium chloride when heated. KClO₃(s) $\to$ KCl(s) + O₂(g) [unbalanced] How many grams of oxygen are formed when 26.4 g of potassium chlorate is heated?

Correct Answer
verified

How many grams of oxygen are needed to react completely with 200.0 g of ammonia,NH₃? 4NH₃(g) + 5O₂(g) $\to$ 4NO(g) + 6H₂O(g)

Correct Answer
verified

In the combustion analysis of 0.1127 g of glucose (C₆H₁₂O₆) ,what mass,in grams,of CO₂ would be produced?

Correct Answer
verified

A compound of bromine and fluorine is used to make UF₆,which is an important chemical in processing and reprocessing of nuclear fuel.The compound contains 58.37 mass percent bromine.Determine its empirical formula.

Correct Answer
verified