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Review questions final - CEM 383 Fall 2007 Final review...

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CEM 383 – Fall 2007 Final review questions 1. 5.00 L of He gas at 1.20 atm is mixed with 4.00 L of Ne gas at 1.25 atm at a temperature of 35.0 ° C to make a total volume of 9.00 L of a mixture. Assuming no temperature change and that He and Ne can be approximated as ideal gases, what is the mole fraction of He in the mix? 2. An unknown noble gas effuses at a rate that is only 0.2188 times that of He at the same temperature. What is the identity of the unknown gas? 3. A sugar syrup is made by adding 588.3 g of fructose (MW = 180.16g/mol) to 1000 g of water in a pressure cooker. a. Calculate the mole fraction of water in the solution. b. What is the boiling point of the syrup at 1atm? 4. An ideal solution of a hydrocarbon A (vapor pressure of the pure substance is 53.0 torr) and a hydrocarbon B (vapor pressure of the pure substance is 87.0 torr), in which the mole fraction of hydrocarbon A is 0.45, is boiled and the vapor condensed to a liquid. The distillation is then repeated. What is the mole fraction of hydrocarbon B in the condensed liquid after the second distillation? 5. Calculate the change in the internal energy for a process in which the system releases 546 J of heat to the surroundings and does 11 J of work on the surroundings.
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