One mole of monoatomic gas and three mol...

One mole of monoatomic gas and three moles of diatomic gas are put together in a container. The molar specific heat (in `JK^(-1)" mol "^(-1)`) at constant volume is (R = 8.3 `J K^(-1) " mol"^(-1)` )

A

18

B

19

C

20

D

21

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A

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