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A closed system consisting of 10 lb of air undergoes a polytropic process from p1 = 65 Ibf/in2, v1 = 4 ft3/lb to a final state where p2 = 20 Ibf/in2, v2 = 10 ft3/lb. Determine the polytropic exponent, n, and the amount of energy transfer by work, in Btu, for the process. Step 1 Your answer is correct. Determine the polytropic exponent, n, for the process. 1.28 Hint Attempts: 1 of 4 used Step 2 * Your answer is incorrect. Determine the amount of energy transfer by work, in Btu, for the process. W = -308571.42 Btu