Chemistry 471 Half Exam 1 9/17/04 Page 1 of 2 Name:____________________________ (Please print clearly on all pages) 1. For the following two processes, state whether each of the four thermodynamic quantitites q, w, ∆E and ∆H is greater than, equal to, or less than zero for the system specified in italics. State explicitly any assumptions that you may need to make. a) A sample of liquid in a thermally insulated container (a calorimeter) is stirred for 1 hr by a mechanical linkage to a motor in the surroundings. b) A sample of H2 gas is mixed with an equimolar amount of N2 gas at the same T and P under conditions where no chemical reaction occurs. The gases may be assumed to behave as ideal gases.Chemistry 471 Half Exam 1 9/17/04 Page 2 of 2 Name:____________________________ (Please print clearly on all pages) 2. The ∆Hº for the hydrogenation of α-linoleic acid (a polyunsaturated fatty acid) is known at 25 ºC. Suppose you are asked by your employer, General Foods, to calculate the ∆H for the reaction at 125 ºC, where the reaction kinetics are faster. You may assume that the pressure for the higher temperature reaction is 1 atm. Write down the method you would use and note what other information you would need to do the calculation. Please use standard symbols for thermodynamic parameters. The reaction is C18H30O2(l) + H2(g) →