KVPY SX SB Exam 2013 Question Paper

Question : 51 of 120

Marks: +1, -0

The entropy change in the isothermal reversible expansion of 2 moles of an ideal gas from 10 to 100 L at 300 K is

Solution:

\ΔS=\nRT/\T\ln v_2/v_1

=\nR\ln v_2/v_1

=2.303\nR\log v_2/v_1

=2.303×2×8.314×1

= 38.3 J/k

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