exam1-06 - Chemistry 342 Spring 2006, February 3 First Exam...

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Chemistry 342 Spring 2006, February 3 First Exam 1. Find n, m and A for which the differential dz = [cos(y) + x n ] dx + A x m sin(y) dy can represent the total differential of a state variable and calculate how much does this variable change between the points (x,y) = (0,0) and (x,y) = (1,1). 2. A good diver fills his lungs with 5 L of air and swims to the depth of 50 m. (assume that his lungs can freely expand/contract and air is an ideal gas; 1 mole = 22.4 L at the standard conditions above the water surface). a) Assuming that the gas stays in the diver’s lungs and his temperature is constant, what is the volume of his lungs at the depth of 50 m? b) Consider now that another diver passes him at 50 m a breathing device and the diver fills his lungs with 5 L of gas at the pressure around, what would be the volume of the diver’s lungs above water, if all the gas is kept inside? c) If your system is the gas in his lungs, what is the work, heat, Δ U, Δ H associated with the first process (going down)? d) What is the (approximate) work done in c) if air is described by the van der
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This note was uploaded on 09/23/2010 for the course CHEM 342 taught by Professor Prestonsnee during the Spring '08 term at Ill. Chicago.

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exam1-06 - Chemistry 342 Spring 2006, February 3 First Exam...

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