During the adiabatic expansion of $2 \,moles$ of a gas, the internal energy was found to have decreased by $100 J$. The work done by the gas in this process is ..... $J$
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(d) For adiabatic process from FLOT
$\Delta W = - \Delta U$ $(\because \Delta Q = 0)$
==> $\Delta W = - ( - 100) = + 100J$
$\Delta W = - \Delta U$ $(\because \Delta Q = 0)$
==> $\Delta W = - ( - 100) = + 100J$
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