Chemistry A Molecular Approach 3rd Edition Test Bank
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Chemistry: A Molecular Approach, 3e (Tro)
Chapter 4 Chemical Quantities and Aqueous Reactions
Multiple Choice
Questions
1) Global warming is
thought to be caused by the increase of one particular gas. Name the gas.
1.
A) oxygen
2.
B) carbon monoxide
3.
C) carbon dioxide
4.
D) nitrogen
5.
E) helium
Answer: C
Diff: 1
Page Ref: 4.1
2) How many grams of
Li3N can be formed from 1.75 moles of Li? Assume an excess of nitrogen.
6 Li(s) +
N2(g) → 2 Li3N(s)
18.
A) 18.3 g Li3N
19.
B) 20.3 g Li3N
20.
C) 58.3 g Li3N
21.
D) 61.0 g Li3N
22.
E) 15.1 g Li3N
Answer: B
Diff: 3
Page Ref: 4.2
3) How many moles of
oxygen are formed when 58.6 g of KNO3 decomposes according to the
following reaction? The molar mass of KNO3 is 101.11 g/mol.
4 KNO3(s)
→ 2 K2O(s) + 2 N2(g) + 5 O2(g)
1.
A) 0.290 mol O2
2.
B) 0.580 mol O2
3.
C) 18.5 mol O2
4.
D) 0.724 mol O2
5.
E) 1.73 mol O2
Answer: D
Diff: 3
Page Ref: 4.2
4) How many moles of
nitrogen are formed when 58.6 g of KNO3 decomposes according to the
following reaction? The molar mass of KNO3 is 101.11 g/mol.
4 KNO3(s)
→ 2 K2O(s) + 2 N2(g) + 5 O2(g)
1.
A) 0.290 mol N2
2.
B) 0.580 mol N2
3.
C) 18.5 mol N2
4.
D) 0.724 mol N2
5.
E) 1.73 mol N2
Answer: A
Diff: 3
Page Ref: 4.2
5) Two samples of
calcium fluoride are decomposed into their constituent elements. The
first sample produced 0.154 g of calcium and 0.146 g of fluorine. If the
second sample produced 294 mg of fluorine, how many g of calcium were formed?
1.
A) 0.280 g
2.
B) 3.09 × 102g
3.
C) 3.13 g
4.
D) 0.309 g
5.
E) 2.80 × 102g
Answer: D
Diff: 3
Page Ref: 4.2
6) Two samples of
potassium iodide are decomposed into their constituent elements. The
first sample produced 13.0 g of potassium and 42.3 g of iodine. If the
second sample produced 24.4 kg of potassium, how many kg of iodine were
produced?
13.
A) 13.3 kg
14.
B) 22.5 kg
15.
C) 79.4 kg
16.
D) 44.4 kg
17.
E) 92.4 kg
Answer: C
Diff: 3
Page Ref: 4.2
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