During the adiabatic expansion of $2$ moles of a gas, the internal energy of the gas is found to decrease by $2$ joules, the work done during the process on the gas will be equal to ....... $J$
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$(d)$ $dQ = 0 = - 2 + dW \Rightarrow dW = 2\;J$
$ \Rightarrow $ Work done by the gas $ = 2\;J$
$ \Rightarrow $ Work done on the gas $ = - 2\;J$
$ \Rightarrow $ Work done by the gas $ = 2\;J$
$ \Rightarrow $ Work done on the gas $ = - 2\;J$
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