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  4. What is the entropy change in 2 mol N2, when its temperature is taken from 400 K to 800 K, at constant pressure?

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Q. What is the entropy change in 2 mol N2, when its temperature is taken from 400 K to 800 K, at constant pressure?

AIIMSAIIMS 2018Thermodynamics

Solution:

$\Delta S=nC_{p} in \frac{T_{2}}{T_{1}}=2\times\frac{7}{2}R\times in \frac{800}{400}=40 $ J/K