InterviewSolution
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InterviewSolution
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For an ideal gas, an illustratio of three different paths `A(B+C)` and `(D+E)` from an initial state `P_(1), V_(1), T_(1)` to a final state `P_(2), V_(2),T_(1)` is shown in the given figure. Path `A`represents a reversible isothermal expansion form `P_(1),V_(1)` to `P_(2),V_(2)`, Path `(B+C)` represents a reversible adiabatic expansion `(B)` from `P_(1),V_(1),T_(1)to P_(3),V_(2),T_(2)` followed by reversible heating the gas at constant volume `(C)`from `P_(3),V_(2),T_(2)` to `P_(2),V_(2),T_(1)`. Path `(D+E)` represents a reversible expansion at constant pressure `P_(1)(D)` from `P_(1),V_(1),T_(1)` to `P_(1),V_(2),T_(3)` followed by a reversible cooling at constant volume `V_(2)(E)` from `P_(1),V_(2),T_(3) to P_(2),V_(2),T_(1)`. What is `DeltaS` for path `A`?A. `nR In (V_(2))/(V_(1))`B. `P(V_(2)-V_(1))`C. `-P(V_(2)-V_(1))`D. `nR(V_(2)-V_(1))` |
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Answer» For path `A` `DeltaS = (q_(rev))/(T) = (nRT)/(T_(1)) In (V_(2))/(V_(1)) = nR In (V_(2))/(V_(1))` |
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