ChE102_F10_Final_-_to_post

# ChE102_F10_Final_-_to_post - ChE 102 Final Exam Fall 2010 1...

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ChE 102 Final Exam – Fall 2010 1) The solubility of CO in water at 25°C and 1 atm CO pressure is 0.0354 mg of CO in 1 mL of water. What is the molarity of an aqueous CO solution at a CO partial pressure of 0.00036 atm and a temperature of 25 o C? A) 4.5×10 -7 M B) 1.6×10 -3 M C) 1.3×10 -5 M D) 2.9×10 -4 M E) 3.2×10 -3 M 2) Pentane (C 5 H 12 ) and hexane (C 6 H 14 ) form an ideal solution. The vapour pressure of pentane at 25 o C is 511 mmHg and that for hexane is 150 mmHg. A solution is prepared by mixing pentane (density = 0.63 g/mL) and hexane (density = 0.66 g/mL). The mole fraction of hexane in the vapour phase in equilibrium with this solution is 0.4. Calculate the volume of hexane that would be present in 1.0 L of this solution. A) 350 mL B) 500 mL C) 720 mL D) 830 mL E) 123 mL 3) Consider the following statements about the phase diagram for carbon dioxide (CO 2 ) shown below. i ) CO 2 is a supercritical fluid at temperatures above 31°C and pressures below 72.9 atm. ii ) CO 2 will condense when the pressure is increased from 5 atm to 60 atm at a constant temperature of 0°C. iii ) Liquid, vapour, and solid CO 2 all exist at a temperature of -56.7°C and a pressure of 5.1 atm. iv ) The normal melting point temperature for CO 2 is -78.5°C. v ) CO 2 will sublime when the temperature is increased from -78.5°C to -10°C at a constant pressure of 10 atm. How many of the statements are true? A) 1 B) 2 C) 3 D) 4 E) 5

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ChE 102 Final Exam – Fall 2010 4) Sulfurous acid (H 2 SO 3 ) is a weak acid that only dissociates 12% in water when its concentration is 1 molal, according to the equation H 2 SO 3 H + + HSO 3 - What is the freezing point of a 1 molal solution of sulfurous acid? Data:
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## This note was uploaded on 12/28/2011 for the course CHE 102 taught by Professor Simon during the Winter '08 term at Waterloo.

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ChE102_F10_Final_-_to_post - ChE 102 Final Exam Fall 2010 1...

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