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Unformatted text preview: Chemistry 1035 Homework 10 HW due on Nov 17 (Tu, Th sections ) and Nov 18 (Fr section) Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com 1. A ballerina weighs 103 lbs and is up on her toes with only 10.0 cm2 of her slippers in contact with the floor. What pressure is she exerting on the floor? A. B. C. D. E. 4.59 × 105 Pa 4.59 × 103 Pa 4.59 × 101 Pa 4.59 × 10ˉ1 Pa 4.59 × 10ˉ3 Pa 2. Which of the lines on the figure below is the best representation of the relationship between the volume of a gas and its pressure, other factors remaining constant? A. B. C. D. E. a b c d e 3. A sample of an ideal gas has its volume doubled while its temperature remains constant. If the original pressure was 100 torr, what is the new pressure? A. B. C. 10 torr 50 torr 100 torr Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com D. E. 200 torr 1000 torr 4. A sample of ammonia gas at 65.5°C and 524 torr has a volume of 15.31 L. What is its volume when the temperature is ‐15.8°C and its pressure is 524 torr? A. B. C. D. E. 3.69 L 11.6 L 20.2 L 63.5 L None of these choices is correct since the volume would have to be negative. 5. Nitrogen dioxide is a red‐brown gas that is responsible for the color of photochemical smog. A sample of nitrogen dioxide has a volume of 28.6 L at 45.3°C and 89.9 kPa. What is its volume at STP? A. B. C. D. E. 21.8 L 27.6 L 29.6 L 37.6 L 153 L 6. What is the density of carbon dioxide gas at ‐25.2°C and 98.0 kPa? A. B. C. D. E. 0.232 g/L 0.279 g/L 0.994 g/L 1.74 g/L 2.09 g/L 7. A gas consists of 85.7 % carbon and 14.3% hydrogen, by weight. A sample of this gas weighing 0.673 g occupies 729 mL at a pressure of 720.0 mmHg and a temperature of 77°C. Calculate its empirical and molecular formulas. A. B. CH, C2H2 CH2, C2H4 Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com C. D. E. CH2, C3H6 CH3, C2H6 CH4, CH4 8. Linolenic acid (C18H30O2) can be hydrogenated to stearic acid by reacting it with hydrogen gas according to the equation: C18H30O2 + H2 → C18H36O2 What volume of hydrogen gas, measured at STP, is required to react with 10.5 g of linolenic acid in this reaction? A. B. C. D. E. 2.53 L 1.69 L 1.27 L 845 mL 422 mL 9. Small quantities of hydrogen can be prepared by the addition of hydrochloric acid to zinc. A sample of 195 mL of hydrogen was collected over water at 25°C and 753 torr. What mass of hydrogen was collected? (Pwater = 24 torr at 25°C) A. B. C. D. E. 0.00765 g 0.0154 g 0.0159 g 0.0164 g 0.159 g 10. Arrange the following gases in order of increasing rate of effusion: C2H6, Ar, HCl, PH3 A. B. C. D. E. Ar < HCl <PH3 < C2H6 C2H6 < PH3 < HCl < Ar Ar < PH3 < C2H6 < HCl C2H6 < HCl < PH3 < Ar Ar <PH3 < HCl < C2H6 ...
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- Fall '09