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When 5 mol of an ideal gas expends from ...

When 5 mol of an ideal gas expends from 10 L to 20 L, temperature of the gas changes from 300 K to 400 K. If the heat capacity `C_p` of the gas is 4.0 cal `mol^-1 K^-1`, then entropy change (in cal `K^-1`) of the gas is
(log2 = 0.30, log3 = 0.47 and `R~=2` cal `mol^-1K^-1`)

A

9.81

B

7.82

C

8.26

D

4.25

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