# Chapter 20 - Entropy and the Second Law of Thermodynamics - Problems: 1a

$W=9.22kJ$

#### 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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