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The temperature of 2 moles of a gas is c...

The temperature of 2 moles of a gas is changed from `20^@C` to `30^@C` when heated at constant volume. If the molar heat capacity at constant volume is `8 J mol^-1 K^-1`, the change in internal energy is

A

`80 J`

B

`20 J`

C

`160 J`

D

`16 J`

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