Find work done on 2 mole of an ideal gas at $27^{\circ} \mathrm{C}$ if it is compressed reversibly and…

Find work done on 2 mole of an ideal gas at $27^{\circ} \mathrm{C}$ if it is compressed reversibly and isothermally from $5.05 \times 10^6 \mathrm{Nm}^{-2}$ to $1.01 \times 10^5 \mathrm{Nm}^{-2}$ pressure.
  1. 19.52 kJ
  2. 1.95 kJ
  3. 39.04 kJ
  4. 3.904 kJ

Solution

$\begin{aligned} \mathrm{W}_{\max } & =-2.303 \mathrm{nRT} \log _{10}\left(\frac{\mathrm{~V}_2}{\mathrm{~V}_{\mathrm{i}}}\right) \\ & =-2.303 \times 2 \mathrm{~mol} \times 8.314 \mathrm{JK}^{-1} \mathrm{~mol}^{-1} \times 300 \mathrm{~K} \\ & \log _{10} \frac{1.01 \times 10^5}{5.05 \times 10^6} \\ & =19.52 \mathrm{~kJ} \end{aligned}$

Asked in: MHT CET 2024 (16 May Shift 1)

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