Questions and Answers
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1.
What is the number of oxygen atoms in one mole of ?-
A.
5
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B.
9
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C.
-
D.
-
A.
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2.Which compound has the empirical formula with the largest mass?
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A.
-
B.
-
C.
-
D.
-
A.
-
3.
When the equation below is balanced for 1 mol of , what is the coefficient for ?-
A.
2
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B.
3
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C.
4
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D.
5
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A.
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4.
Calcium carbonate decomposes on heating as shown below. When 50 g of calcium carbonate are decomposed, 7 g of calcium oxide are formed. What is the percentage yield of calcium oxide?-
A.
7 %
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B.
25 %
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C.
50 %
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D.
75 %
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A.
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5.
5 of carbon monoxide, CO(g), and 2 of oxygen, (g), at the same temperature and pressure are mixed together. Assuming complete reaction according to the equation given, what is the maximum volume of carbon dioxide, (g), in , that can be formed?-
A.
3
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B.
4
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C.
5
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D.
7
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A.
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6.
A gas sample occupies a volume at a pressure and a Kelvin temperature . What would be the temperature of the gas, , if both its pressure and volume are doubled?-
A.
-
B.
-
C.
-
D.
-
A.
-
7.
A blast furnace contains 1600 kg of iron(III) oxide ( = 160) and 144 kg of carbon ( = 12). Assuming that they react according to the following equation: what is the limiting reagent and the maximum theoretical yield of iron?-
A.
Iron(III) oxide; 560 kg
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B.
Iron(III) oxide; 1120 kg
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C.
Carbon; 224 kg
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D.
Carbon 448 kg
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A.
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8.
Which sample of nitrogen gas, , contains the greatest number of nitrogen molecules?-
A.
1.4 g
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B.
1.4 of at Pa and 273 K
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C.
molecules
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D.
1.4 mol
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A.
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9.
What will be the concentration of sulfate ions in when 0.20 mol is dissolved in water to give 100 of aqueous solution?-
A.
0.2
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B.
1.0
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C.
2.0
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D.
4.0
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A.
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10.
What volume, in , of 0.200 HCl(aq) is required to neutralize 25.0 of 0.200 (aq)?-
A.
12.5
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B.
25.0
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C.
50.0
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D.
75.0
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A.
