KVPY SX SB Exam 2012 Question Paper

Question : 107 of 120

Marks: +1, -0

The ΔH for vaporization of a liquid is 20 kJ/mol. Assuming ideal behaviour, the change in internal energy for the vaporization of 1 mol of the liquid at 60°C and 1 bar is close to

13.2 kJ/mol
17.2 kJ/mol
19.5 kJ/mol
20.0 kJ/mol

Validate

Solution:

\ΔH=\ΔE=\Δn_gRT

20=\ΔE+8.314×10^{-3}×333

\Δ=17.2\kJ\/\mol

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