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Six moles of O(2) gas is heated from 20^...

Six moles of `O_(2)` gas is heated from `20^(@)C` to `35^(@)C` at constant volume . If specific heat capacity at constant pressure is `8 " cal mol"^(-1)-K^(-1) and R=8.31"J mol"^(-1)-K^(-1)` , what is change in internal energy of gas ?

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