Question 1

Write the balanced equation for the reaction that occurs when methanol,CH3OH (l) ,is burned in air. What is the coefficient of methanol in the balanced equation?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  3/2F) A) and E)
G) C) and E)

Question 2

How many moles of lithium phosphate (Li3PO4) are contained in 66.6 g of lithium phosphate?

Accepted Answer

A)  0.575
B)  7710
C)  1.11 × 10-22
D)  4.01 × 1025
E)  116F) C) and E)
G) B) and C)

Question 3

There are ________ hydrogen atoms in 25 molecules of C4H4S2.

Accepted Answer

A)  25
B)  3.8 × 1024
C)  6.0 × 1025
D)  100
E)  1.5 × 1025F) B) and E)
G) A) and B)

Question 4

There are ________ oxygen atoms in 30 molecules of C20H42S3O2.

Accepted Answer

A)  6.0 × 1023
B)  1.8 × 1025
C)  3.6 × 1025
D)  1.2 × 1024
E)  60F) None of the above
G) All of the above

Question 5

When the following equation is balanced,the coefficient of sulfur dioxide is ________. PbS (s) + O2 (g) → PbO (s) + SO2 (g)

Accepted Answer

A)  5
B)  1
C)  3
D)  2
E)  4F) A) and B)
G) A) and C)

Question 6

One mole of ________ contains the smallest number of atoms.

Accepted Answer

A)  S8
B)  C10H8
C)  Al2(SO4) 3
D)  Na3PO4
E)  NaClF) A) and B)
G) A) and C)

Question 7

When the following equation is balanced,the coefficient of H2SO4 is ________. H2SO4 (aq) + NaOH (aq) → Na2SO4 (aq) + H2O (l)

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  0.5F) B) and D)
G) All of the above

Question 8

Solid aluminum and gaseous oxygen react in a combination reaction to produce aluminum oxide: 4Al (s) + 3O2 (g) → 2Al2O3 (s) 
The maximum amount of Al2O3 that can be produced from 5.0 g of Al and 5.0 g of O2 is ________ g.

Accepted Answer

A)  19
B)  4.7
C)  9.4
D)  11
E)  2.5F) All of the above
G) B) and D)

Question 9

Lead (II) carbonate decomposes to give lead (II) oxide and carbon dioxide: PbCO3 (s) → PbO (s) + CO2 (g) 
How many grams of lead (II) oxide will be produced by the decomposition of 2.50 g of lead (II) carbonate?

Accepted Answer

A)  0.41
B)  2.50
C)  0.00936
D)  2.09
E)  2.61F) A) and D)
G) B) and C)

Question 10

A 1.038 g sample of unknown containing C,H,and O yielded 2.48 g of CO2 and 0.510 g of H2O during combustion analysis.Determine the empirical formula of the compound.

Accepted Answer

A)  C3H3O
B)  C6H6O
C)  CH3O
D)  C6H6O2
E)  C2H6O2F) C) and D)
G) A) and C)

Question 11

Calcium carbide (CaC2) reacts with water to produce acetylene (C2H2) as shown in the unbalanced reaction below: CaC2 (s) + H2O (g) → Ca(OH) 2 (s) + C2H2 (g) 
How many grams of H2O are required to completely react with 82.4 g of CaC2.

Accepted Answer

A)  1.29
B)  11.6
C)  46.3
D)  23.2
E)  18.0F) B) and D)
G) B) and C)

Question 12

How many grams of phenol (C6H5OH) are contained in 5.50 mol of phenol?

Accepted Answer

A)  518
B)  0.0584
C)  9.14 × 10-24
D)  3.31 × 1024
E)  94.1F) D) and E)
G) A) and D)

Question 13

Lithium and nitrogen react to produce lithium nitride: 6Li (s) + N2 (g) → 2Li3N (s) 
How many moles of N2 are needed to react with 0.550 mol of lithium?

Accepted Answer

A)  3.30
B)  0.550
C)  0.183
D)  1.65
E)  0.0917F) None of the above
G) B) and E)

Question 14

A compound contains 40.0% C,6.71% H,and 53.29% O by mass.The molecular weight of the compound is 60.05 amu.The molecular formula of this compound is ________.

Accepted Answer

A)  C2H4O2
B)  CH2O
C)  C2H3O4
D)  C2H2O4
E)  CHO2F) B) and D)
G) C) and D)

Question 15

Balance the following reaction and determine the coefficient of H2O. CO (g) + H2 (g) → H2O (g) + CH4 (g)

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  0F) C) and D)
G) B) and D)

Question 16

A compound contains 38.7% K,13.9% N,and 47.4% O by mass.What is the empirical formula of the compound?

Accepted Answer

A)  KNO3
B)  K2N2O3
C)  KNO2
D)  K2NO3
E)  K4NO5F) D) and E)
G) A) and D)

Question 17

There are ________ mol of carbon atoms in 5 mol of dimethylsulfoxide (C2H6SO) .

Accepted Answer

A)  2
B)  5
C)  10
D)  12
E)  50F) None of the above
G) All of the above

Question 18

1 mole of which of the following will contain the largest number of atoms?

Accepted Answer

A)  sodium
B)  magnesium
C)  mercury
D)  neon
E)  1 mole of any element will contain the same number of atoms.F) B) and E)
G) A) and B)

Question 19

Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride: S (s) + 3F2 (g) → SF6 (g) 
In a particular experiment,the percent yield is 83.1%. This means that in this experiment,a 4.50 g sample of fluorine yields ________ g of SF6 .

Accepted Answer

A)  9.58
B)  3.74
C)  4.79
D)  43.1
E)  14.4F) A) and B)
G) C) and D)

Question 20

Which of the following are decomposition reactions?
1. CH4 (g)  + O2 (g)   →\rightarrow→  CO2 (g)  + H2O (l)  
2. CaO (s)  + CO2 (g)   →\rightarrow→ CaCO3 (s) 
3. Mg (s)  + O2(g)   →\rightarrow→  MgO (s)  
4. PbCO3 (s)   →\rightarrow→  PbO (s)  + CO2 (g)

Accepted Answer

A)   1, 2, and 3
B)   4 only
C)   1, 2, 3, and 4
D)   2 and 3
E)   2, 3, and 4 F) C) and D)
G) A) and B)

Exam 3: Chemical Reactions and Reaction Stoichiometry

How many moles of lithium phosphate (Li3PO4) are contained in 66.6 g of lithium phosphate?

Correct AnswerverifiedShow Answer

1 mole of which of the following will contain the largest number of atoms?

Correct AnswerverifiedShow Answer

Write the balanced equation for the reaction that occurs when methanol,CH3OH (l) ,is burned in air. What is the coefficient of methanol in the balanced equation?

Correct AnswerverifiedShow Answer

A compound contains 40.0% C,6.71% H,and 53.29% O by mass.The molecular weight of the compound is 60.05 amu.The molecular formula of this compound is ________.

Correct AnswerverifiedShow Answer

There are ________ hydrogen atoms in 25 molecules of C4H4S2.

Correct AnswerverifiedShow Answer

A compound contains 38.7% K,13.9% N,and 47.4% O by mass.What is the empirical formula of the compound?

Correct AnswerverifiedShow Answer

Lithium and nitrogen react to produce lithium nitride: 6Li (s) + N2 (g) → 2Li3N (s) How many moles of N2 are needed to react with 0.550 mol of lithium?

Correct AnswerverifiedShow Answer

Calcium carbide (CaC2) reacts with water to produce acetylene (C2H2) as shown in the unbalanced reaction below: CaC2 (s) + H2O (g) → Ca(OH) 2 (s) + C2H2 (g) How many grams of H2O are required to completely react with 82.4 g of CaC2.

Correct AnswerverifiedShow Answer

One mole of ________ contains the smallest number of atoms.

Correct AnswerverifiedShow Answer

Balance the following reaction and determine the coefficient of H2O. CO (g) + H2 (g) → H2O (g) + CH4 (g)

Correct AnswerverifiedShow Answer

Which of the following are decomposition reactions? 1. CH4 (g) + O2 (g) →\rightarrow→ CO2 (g) + H2O (l) 2. CaO (s) + CO2 (g) →\rightarrow→ CaCO3 (s) 3. Mg (s) + O2(g) →\rightarrow→ MgO (s) 4. PbCO3 (s) →\rightarrow→ PbO (s) + CO2 (g)

Correct AnswerAnswered by ExamLex AIShow Answer

When the following equation is balanced,the coefficient of sulfur dioxide is ________. PbS (s) + O2 (g) → PbO (s) + SO2 (g)

Correct AnswerverifiedShow Answer

There are ________ oxygen atoms in 30 molecules of C20H42S3O2.

Correct AnswerverifiedShow Answer

Lead (II) carbonate decomposes to give lead (II) oxide and carbon dioxide: PbCO3 (s) → PbO (s) + CO2 (g) How many grams of lead (II) oxide will be produced by the decomposition of 2.50 g of lead (II) carbonate?

Correct AnswerverifiedShow Answer

When the following equation is balanced,the coefficient of H2SO4 is ________. H2SO4 (aq) + NaOH (aq) → Na2SO4 (aq) + H2O (l)

Correct AnswerverifiedShow Answer

There are ________ mol of carbon atoms in 5 mol of dimethylsulfoxide (C2H6SO) .

Correct AnswerverifiedShow Answer

Solid aluminum and gaseous oxygen react in a combination reaction to produce aluminum oxide: 4Al (s) + 3O2 (g) → 2Al2O3 (s) The maximum amount of Al2O3 that can be produced from 5.0 g of Al and 5.0 g of O2 is ________ g.

Correct AnswerverifiedShow Answer

Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride: S (s) + 3F2 (g) → SF6 (g) In a particular experiment,the percent yield is 83.1%. This means that in this experiment,a 4.50 g sample of fluorine yields ________ g of SF6 .

Correct AnswerverifiedShow Answer

A 1.038 g sample of unknown containing C,H,and O yielded 2.48 g of CO2 and 0.510 g of H2O during combustion analysis.Determine the empirical formula of the compound.

Correct AnswerverifiedShow Answer

How many grams of phenol (C6H5OH) are contained in 5.50 mol of phenol?

Correct AnswerverifiedShow Answer

How many moles of lithium phosphate (Li₃PO₄) are contained in 66.6 g of lithium phosphate?

Correct Answer
verified

Correct Answer
verified

Write the balanced equation for the reaction that occurs when methanol,CH₃OH (l) ,is burned in air. What is the coefficient of methanol in the balanced equation?

Correct Answer
verified

Correct Answer
verified

There are ________ hydrogen atoms in 25 molecules of C₄H₄S₂.

Correct Answer
verified

Correct Answer
verified

Lithium and nitrogen react to produce lithium nitride: 6Li (s) + N₂ (g) → 2Li₃N (s) How many moles of N₂are needed to react with 0.550 mol of lithium?

Correct Answer
verified

Calcium carbide (CaC₂) reacts with water to produce acetylene (C₂H₂) as shown in the unbalanced reaction below: CaC₂ (s) + H₂O (g) → Ca(OH) ₂ (s) + C₂H₂ (g) How many grams of H₂O are required to completely react with 82.4 g of CaC₂.

Correct Answer
verified

Correct Answer
verified

Balance the following reaction and determine the coefficient of H₂O. CO (g) + H₂(g) → H₂O (g) + CH₄(g)

Correct Answer
verified

Which of the following are decomposition reactions? 1. CH₄ (g) + O₂ (g) $\rightarrow$ CO₂ (g) + H₂O (l) 2. CaO (s) + CO₂(g) $\rightarrow$ CaCO₃ (s) 3. Mg (s) + O₂(g) $\rightarrow$ MgO (s) 4. PbCO₃ (s) $\rightarrow$ PbO (s) + CO₂ (g)

Correct Answer
Answered by ExamLex AI

When the following equation is balanced,the coefficient of sulfur dioxide is ________. PbS (s) + O₂(g) → PbO (s) + SO₂(g)

Correct Answer
verified

There are ________ oxygen atoms in 30 molecules of C₂₀H₄₂S₃O₂.

Correct Answer
verified

Lead (II) carbonate decomposes to give lead (II) oxide and carbon dioxide: PbCO₃ (s) → PbO (s) + CO₂(g) How many grams of lead (II) oxide will be produced by the decomposition of 2.50 g of lead (II) carbonate?

Correct Answer
verified

When the following equation is balanced,the coefficient of H₂SO₄ is ________. H₂SO₄(aq) + NaOH (aq) → Na₂SO₄(aq) + H₂O (l)

Correct Answer
verified

There are ________ mol of carbon atoms in 5 mol of dimethylsulfoxide (C₂H₆SO) .

Correct Answer
verified

Solid aluminum and gaseous oxygen react in a combination reaction to produce aluminum oxide: 4Al (s) + 3O₂ (g) → 2Al₂O₃ (s) The maximum amount of Al₂O₃ that can be produced from 5.0 g of Al and 5.0 g of O₂is ________ g.

Correct Answer
verified

Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride: S (s) + 3F₂(g) → SF₆(g) In a particular experiment,the percent yield is 83.1%. This means that in this experiment,a 4.50 g sample of fluorine yields ________ g of SF_{6 .}

Correct Answer
verified

A 1.038 g sample of unknown containing C,H,and O yielded 2.48 g of CO₂ and 0.510 g of H₂O during combustion analysis.Determine the empirical formula of the compound.

Correct Answer
verified

How many grams of phenol (C₆H₅OH) are contained in 5.50 mol of phenol?

Correct Answer
verified