\( = n\left( {\frac{{5R}}{2}} \right)\left( {{T_B} - {T_A}} \right)\) \([for\,diatomic\,gas,{C_v} = \frac{{5R}}{2}]\)
\( = \frac{{5nR}}{2}\left( {\frac{{{P_B}{V_B}}}{{nR}} - \frac{{{P_A}{V_A}}}{{nR}}} \right)\)
\(\left[ {PV = nRT} \right]\)
\( = \frac{5}{2}\left( {{P_B}{V_B} - {P_A}{V_A}} \right)\)
\( = \frac{5}{2}\left( {2 \times {{10}^3} \times 6 - 5 \times {{10}^3} \times 4} \right)\)
\( = \frac{5}{2}\left( { - 8 \times {{10}^3}} \right) = - 20\,kJ\)