When a gas expands adiabatically
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(c) $\Delta Q = \Delta U + \Delta W = 0$ ==> $\Delta W = - \Delta U$
if $\Delta W$ is positive i.e., gas does work then $\Delta U$ should be negative meaning internal energy is used in doing work.
if $\Delta W$ is positive i.e., gas does work then $\Delta U$ should be negative meaning internal energy is used in doing work.
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