Answer
$W=9.22kJ$
Work Step by Step
We know that for isothermal process;
$W=nRTln\frac{V_f}{V_i}$
We plug in the known values to obtain:
$W=4(8.31)(400)ln\frac{2V_1}{V_1}=9216.085=9.22\times 10^3=9.22kJ$
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