Page 1298 - Chemistry--atom first
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Answer Key
51. 4.50 kg SiO2 53.5.00 103 kg
55. 1.28 105 g CO2
57. 161.40 mL KI solution
59. 176 g TiO2
61. The limiting reactant is Cl2.
63.
65.
67.
69. Convert mass of ethanol to moles of ethanol; relate the moles of ethanol to the moles of ether produced using the stoichiometry of the balanced equation. Convert moles of ether to grams; divide the actual grams of ether (determined through the density) by the theoretical mass to determine the percent yield; 87.6%
71. The conversion needed is Then compare the amount of Cr to the amount of acid present. Cr is the limiting reactant.
73. Na2C2O4 is the limiting reactant. percent yield = 86.6%
75. Only four molecules can be made.
77. This amount cannot be weighted by ordinary balances and is worthless. 79. 3.4 10−3 M H2SO4
81. 9.6 10−3 M Cl−
83. 22.4%
85. The empirical formula is BH3. The molecular formula is B2H6.
87. 49.6 mL
89. 13.64 mL
91. 0.0122 M
93. 34.99 mL KOH
95. The empirical formula is WCl4.
Chapter 8
1. The cutting edge of a knife that has been sharpened has a smaller surface area than a dull knife. Since pressure is force per unit area, a sharp knife will exert a higher pressure with the same amount of force and cut through material more effectively.
3. Lying down distributes your weight over a larger surface area, exerting less pressure on the ice compared to standing up. If you exert less pressure, you are less likely to break through thin ice.
5. 0.809 atm; 82.0 kPa
7.2.2 102 kPa
9. Earth: 14.7 lb in–2; Venus: 1.31 × 103 lb in−2 11. (a) 101.5 kPa; (b) 51 torr drop
13. (a) 264 torr; (b) 35,200 Pa; (c) 0.352 bar 15. (a) 623 mm Hg; (b) 0.820 atm; (c) 83.1 kPa
17. With a closed-end manometer, no change would be observed, since the vaporized liquid would contribute equal, opposing pressures in both arms of the manometer tube. However, with an open-ended manometer, a higher pressure reading of the gas would be obtained than expected, since Pgas = Patm + Pvol liquid.
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