On the basis of the following graph (P-V graph), choose the correct statements.

The over all process can be depicted as

Hence, $\mathrm{\Delta }E=0,\mathrm{\Delta }H=0,\mathrm{\Delta }S=0\text{ (cyclic process) }$and $\mathrm{\Delta E}=\mathrm{q}+\mathrm{W}\text{ (1st law) }$

$\therefore 0=q+W$ or q = - W

$\text{ Total work done }=W_{A\to B}+W_{B\to C}+W_{C\to A}$

$\therefore \mathrm{W}=-\mathrm{P}\left({\mathrm{V}}_{\mathrm{B}}-{\mathrm{V}}_{\mathrm{A}}\right)+0+2.303\mathrm{nRT} \log \frac{{\mathrm{V}}_{\mathrm{C}}}{{\mathrm{V}}_{\mathrm{A}}}$

$=-(40-20)+0+2.303\times 1\times 0.082\times \log \frac{V_C}{V_A}$

= - 6.13 litre-atmosphere

= - 620.77 J