Question

For $P-V$ diagram shown for a diatomic ideal gas, heat given to the gas from $A$ to $B$ is (in $kJ)$.

Answer 1

$W=$ Area of $P-V$ diagram from $A$ to $B=\frac{1}{2}(1+2)\times 1=\frac{3}{2}\times {10}^3=1500J$
$△U=\frac{C_V}{R}(P_f{V}_f-P_i{V}_i)=\frac{5}{2}\times (3\times 1000)=7500J$
$△Q=W+△U=9000J=9kJ$.