AnswersCR SS Chemistry S2 201819 2026Scientific Notation and Significant Figures

Introduction to Stoichiometry Answers

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Consider the reaction below.2H2O 2H2 + O2How many moles of hydrogen are produced when 6.28 mol of oxygen form?

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A
3.14 mol
B
6.28 mol
C
12.6 mol
D
25.2 mol
2
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The following balanced equation shows the formation of water.2H2 + O2 2H2OHow many moles of oxygen (O2) are required to completely react with 27.4 mol of H2?

Question illustration
A
6.8 mol
B
13.7 mol
C
54.8 mol
D
109.6 mol
3

Consider the equation below.N2 + 3H2 2NH3What is the mole ratio of hydrogen to ammonia?

Question illustration
A
1:1
B
1:2
C
3:2
D
5:4
4

Consider the balanced equation below.8H2 + S8 8H2SBased on the mole ratios, what can most likely be predicted?

Question illustration
A
1 mol of hydrogen will react with 1 mol of sulfur.
B
8 mol of hydrogen will react with 1 mol of sulfur.
C
8 mol of hydrogen will react with 8 mol of sulfur.
D
16 mol of hydrogen will react with 8 mol of sulfur.
5

Consider the balanced equation below. What is the mole ratio of to Fe?

Question illustration
A
1:3
B
1:4
C
3:1
D
4:3
6

The balanced chemical equation for the reaction of hydrogen and oxygen is shown below.2H2 + O2 2H2OThe number of moles of hydrogen that is needed to produce 0.253 mol of water is

Question illustration
A
smaller than 0.253 mol.
B
much greater than 0.253 mol.
C
slightly greater than 0.253 mol.
D
equal to 0.253 mol.
7

The reaction below shows how silver chloride can be synthesized.AgNO3 + NaCl NaNO3 + AgClHow many moles of silver chloride are produced from 15.0 mol of silver nitrate?

Question illustration
A
1.0 mol
B
15.0 mol
C
30.0 mol
D
45.0 mol
8

The balanced chemical equation for the reaction of copper (Cu) and silver nitrate (AgNO3) is shown below.Cu + 2AgNO3 2Ag + Cu(NO3)2How many moles of copper must react to form 3.50 mol of Ag?

Question illustration
A
0.175 mol
B
1.75 mol
C
7.00 mol
D
17.0 mol
9

Acid rain can be destructive to both the natural environment and human-made structures. The equation below shows a reaction that occurs that may lead to the formation of acid rain. 3NO2 + H2O 2HNO3 + NOHow many moles (precise to the nearest 0.01 mol) of nitric acid are produced from 300.00 mol of nitrogen dioxide?

Question illustration
A
200.00 mol
B
200.09 mol
C
450.00 mol
D
450.02 mol
10

Consider the reaction below.2Al2O3 4Al + 3O2How many moles of oxygen are produced when 26.5 mol of aluminum oxide are decomposed?

Question illustration
A
17.7 mol
B
19.9 mol
C
39.8 mol
D
53.0 mol
11

Consider the reaction below.2H2 + O2 2H2OHow many moles of water are produced from 13.35 mol of oxygen?

Question illustration
A
6.675 mol
B
26.70 mol
C
53.40 mol
D
66.75 mol
12

The following balanced equation shows the formation of ethane (C2H6).C2H2 + 2H2 C2H6How many moles of hydrogen are needed to produce 13.78 mol of ethane?

Question illustration
A
3.445 mol
B
6.890 mol
C
27.56 mol
D
55.12 mol
13

Review the equation below.2KClO3 2KCl + 3O2How many moles of oxygen are produced when 2 mol of potassium chlorate (KClO3) decompose?

Question illustration
A
1
B
2
C
3
D
6

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