Question
1) Compare the heat flow and entropy change of adiabatic expansion of an ideal gas from V i to V f (and pressure p f
1) Compare the heat flow and entropy change of adiabatic expansion of an ideal gas from Vi to Vf (and pressure pf ) to a two-step process involving isothermal expansion from Vi to Vf , followed by a constant volume depressurization from to pressure pf
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2) For 0.2 mol of ideal monatomic gas, calculate the entropy change for the system and the surroundings for irreversible expansion and heat flow from p1 = 500,000 Pa, V1 = 0.001 m3, T1 = 300 K, to a final state that is in thermal equilibrium with the surroundings at pf = 24,942 Pa, Tf = 300 K, Vf = 0.02 m3. To do th*is, assume the surroundings is both a thermal reservoir (constant T = Tf with a thermal response time much shorter than the system's) and a mechanical reservoir (constant psurr = 15,310 with a mechanical response time much shorter than the system's). Hint: one way to do this* is to compare the irreversible expansion to a two-step process in which the first step is an irreversible adiabatic expansion to Vf , and the second step is a constant volume heating to Tf
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