Practice quiz ch.6
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If a dozen paper clips weighs 9.6 grams, and a pile of paper clips weighs 14.4 grams, how many paper clips are in the pile? Less than 10 12 18 More than 1000
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18
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One dozen golf balls and one dozen ping-pong balls have the same mass. True False
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false
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One mole of pennies weighs 6.022 × 1023 grams. True False
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false
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How many moles of zinc atoms are in a sample of zinc that has 8.16 × 1023 zinc atoms? 0.738 moles 1.36 moles 4.91 × 1047 2.04× 10−48
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1.36 moles
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The molar mass of a molecular compound is the mass of one molecule in units of grams. True False
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false
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How many moles of sulfur are in a sample of sulfur that weighs 24.2 grams? 1.33 mol 0.755 mol 56.3 mol 7.90 mol
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0.755 mol
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How many copper atoms are in a copper wire that has a mass 5.16 grams? 4.89 × 1022 atoms 1.97 × 1026 atoms 3.11 × 1024 atoms 0.0812 atoms
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4.89 × 1022 atoms
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Calculate the molar mass of sulfur dioxide. 48.07 amu 64.07 g/mol 64.07 amu 48.07 g/mol
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64.07 g/mol
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How many moles of chlorine atoms are in 16 moles of carbon tetrachloride? 4 3.85 × 1025 64 0.25
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64
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A compound composed of copper and oxygen has a mass of 8.160 grams. The compound is decomposed and the copper found to have a mass of 6.491 grams. What is the mass percent copper in the compound? 20.45% 1.257 0.7955% 79.55
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79.55
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The mass percent of carbon in carbon disulfide, CS2, is 33.33 %. True False
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false
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What is the mass percent of nitrogen in nitrogen dioxide? 69.55 46.68 30.45 0.3045
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30.45
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What is the empirical formula of fructose, C6H12O6? C2H4O2 CH2O CHO C12H24O12
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CH2O
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In order to determine a molecular formula from an empirical formula, the molar mass of the compound must be known. True False
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True
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A compound of empirical formula HO has a molar mass of 34.02 g/mol. What is its molecular formula? HO HO2 H2O2 H2O
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H2O2
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If one gross of golf tees has a mass of 118.80 grams, and a pack of golf tees has a mass of 412.50 g, how many golf tees are in the pack? 500 7 million 41 Approximately 4
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500
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The formula for sodium chloride, NaCl, indicates that for every one gram of sodium there is one gram of chlorine. True False
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false
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How many moles of water molecules are in a water sample that contains 2.18 × 1024 water molecules? 0.276 mol 7.62 × 10−49 mol 1.31 × 1048 mol 3.62 mol
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3.62 mol
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What is the mass of 0.940 mole of neon? 21.5 g 20.18 g 0.0466 g 19.0 g
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19.0 g
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What is the mass in grams of 5.16 × 1022 chromium atoms? 0.0857 g 2.68 &time; 1024 g 4.46 g 11.7 g
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4.46 g
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What is the mass, in grams, of 7.18 × 1024 molecules of chlorine? 5.95 g 423 g 845 g 0.168 g
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845 g
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How many grams of bromine are in 1.57 grams of phosphorus tribromide? 16.0 g 0.0174 g 0.463 g 1.39 g
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1.39 g
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The chemical formula N2O4 indicates that there are two nitrogen atoms per four moles of oxygen atoms. True False
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false
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Calcium chloride is 36.11% calcium by mass. How many grams of calcium are in 40.0 grams of calcium chloride? 0.903 g 14.4 g 1.11 g 25.6 g
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14.4 g
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A compound's chemical formula can be used to compute the mass percent of any element in the compound. True False
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true
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Calculate the mass percent oxygen in magnesium nitrate. 55.81% 64.72 % 53.93 % 71.47 %
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64.72%
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Find the empirical formula of a compound that contains 7.01 g N and 16.00 g O. NO3 N2O NO NO2
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NO2
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The empirical formula will always be a whole-number multiple of the molecular formula. True False
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false
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A compound has an empirical formula P2O5 and a molar mass of 283.88 g/mol. What is the molecular formula of the compound? P4O5 P2O5 P4O10 P2O10
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P4O10
