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Q.

The change in entropy of the system when 2 mole of a diatomic ideal gas is heated from 400 K to 800 K under constant pressure :

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a

$R \ln 2$

b

$5 R In 2$

c

$3 R In 2$

d

$7 R \ln 2$

answer is B.

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Detailed Solution

$ΔS = n R \ln (\frac{P_{1}}{P_{2}}) + n C_{p m} \ln (\frac{T_{1}}{T_{2}})$

$2 \times \frac{7}{2} R \ln 2 = 7 R \ln 2$

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