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If one monoatomic gas is expanded adibatically from $2 \mathrm{~L}$ to $10 \mathrm{~L}$ at $1 \mathrm{~atm}$ external pressure then the value of $\Delta U$ (in atm $\mathrm{L}$ ) is
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$-8$
$\begin{aligned} & Q=0 \quad(\because \text { process is adiabatic. }) \\ & \Delta U=w=-P_{\mathrm{ext}} \Delta V \\ & =-1(10-2) \text { atm } \mathrm{L}=-8 \text { atm L } \\ & \end{aligned}$
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