NEET Chemistry Thermodynamics / रासायनिक उष्मागतिकी NEET PYQ-Thermodynamics

2 mole of ideal gas at \[27{}^\circ C\] temperature is expanded reversibly from 2 L to 20 L. Find entropy change (R = 2 cal/mol K):                                                                                                                   [AIPMT 2002]

A) 92.1

B)      0

C) 4

D)      9.2

Correct Answer: D

Solution :

\[\Delta S\] (Entropy change) \[=2.303\,\,nR\,\,{{\log }_{10}}\,\frac{{{V}_{2}}}{{{V}_{1}}}\]

\[=2.303\times 2\times 2\times {{\log }_{10}}\,\frac{20}{2}\]

\[=2.303\times 2\times 2\times 1\]

\[=9.212\,cal\]