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su04exam2

# su04exam2 - 1 A 1.257g sample of formaldehyde CH2O is...

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1 A 1.257g sample of formaldehyde CH 2 O is burned according to the reaction below. The gas produced is collected over water at 33.0 °C. What volume will be produced if the atmospheric pressure is 765.5 Torr? The vapor pressure of water at 33 °C is 37.7 Torr. CH 2 O( l ) + O 2 (g) CO 2 (g) + H 2 O( l ) A. 1098 mL B. 32.98 mL C. 32.98 L D. 1045 mL E. 1.446 mL 2 What is the average velocity (u rms ) of UF 6 at 400K? A. 0.529 m/s B. 168 m/s C. 28,300 m/s D. 5.32 m/s E. 218 m/s 3 The time required for 0.010 mol of SO 3 (g) to effuse through an opening was 22s. Under the same conditions, it took 28s for 0.010 mol of an unknown gas to escape. What was the unknown gas? A. UF 6 B. SiF 6 C. Xe D. CF 4 E. SF 6

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4 In which gas would the ratio of C p /C v be closest to 1? A. Ar B. Cl 2 C. F 2 D. CH 4 E. CO 2 5 A piston is heated with an electric heater providing 2.50 W for 15.0 s. The piston compresses the gas by 255 mL against a pressure of 256 Torr. What is the E of the piston? [Note: 1W = 1 J/s] A. -46.2J B. 37.4J C. ±27.8J D. 123J E. 46.2J 6 Given the following information: 2NOCl(g) 2NO(g) + Cl 2 (g) H = 75.56 kJ 2NO(g) O 2 (g) 2NO 2 (g) H = -113.05 kJ 2NO 2 (g) N 2 O 4 (g) H = -58.03 kJ Compute H for the reaction N 2 O 4 (g) + Cl 2 (g) 2NOCl(g) + O 2 (g) A. 95.52 kJ B. -246.65 kJ C. 113.03 kJ D. 95.52 kJ E. 246.65 kJl
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