Question 17 of 17 Four moles of an ideal gas, with a constant Map volume heat ca

Question

Question 17 of 17 Four moles of an ideal gas, with a constant Map volume heat capacity of 21.1 J/K, transformed p [Pa] from state A to state rding to the on the right. What was the change in the entropy of the gas? Number 321 K 291 K 40 V [cm 10 20 30 O Previous Give Up & View solution Check Answer Next D Exit Hint How does the volume change during the transformation from state A to state B? Note that you are given the constant volume heat capacity of the gas sample, not the specific heat. The difference is that specific heats are given per unit quantity of a substance, while heat capacities take into account the amount of the substance in question.

Explanation / Answer

delta S = n*Cv*ln(Pb/Pa) + n*Cp*ln(Vb/Va)
Here Vb = Va so, 2nd term becomes 0 as ln 1 =0
delta S = n*Cv*ln(Pb/Pa)
          = 4*21.1* ln (3.5/1.5)
           = 71.5 J/K
Answer : 71.5 J/K

Volume is constant from A to B as shown in graph

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