KVPY SX SB Exam 2012 Question Paper

Question : 109 of 120

Marks: +1, -0

Three moles of an ideal gas expands reversibly under isothermal condition form 2 L to 20 L at 300 K. The amount of heat-change (in kJ/mol) in the process is –

0
7.2
10.2
17.2

Validate

Solution:

\W= 2.303\nRT \log \V_2/\V_1

=-2.303×3×8.314×

10^{-3}×300\log 20/2

=- 17.2\kJ\/\mol

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