For a sample of perfect gas- when its pressure is changed isothermally from P-i to P-f- the entropy change is given by-triangle S - nRT dfrac-P-f-P-i- triangle S - nR dfrac-P-f-P-i-triangle S - RT dfrac-P-i-P-f- triangle S - nR dfrac-P-i-P-f-

Question

For a sample of perfect gas- when its pressure is changed isothermally from P-i to P-f- the entropy change is given by-triangle S - nRT  dfrac-P-f-P-i- triangle S - nR  dfrac-P-f-P-i-triangle S - RT  dfrac-P-i-P-f- triangle S - nR  dfrac-P-i-P-f-

Toppr Admin · Accepted Answer

For a sample of perfect gas, when its pressure is changed isothermally from Pi to Pf, the entropy change is given by:△S=nRT ln PfPi△S=nR ln PfPi△S=RT ln PiPf△S=nR ln PiPf

For a sample of perfect gas, when its pressure is changed isothermally from $P_{i}$ to $P_{f}$ , the entropy change is given by:
$△ S = n R T$ ln $\frac{P_{f}}{P_{i}}$
$△ S = n R$ ln $\frac{P_{f}}{P_{i}}$
$△ S = R T$ ln $\frac{P_{i}}{P_{f}}$
$△ S = n R$ ln $\frac{P_{i}}{P_{f}}$