You are given that Mass of ${ }_3^{\prime} \mathrm{Li}=7.0160 \mathrm{u}$, Mass of ${ }_2^4 \mathrm{He}=4.0026 \mathrm{u}$ and Mass of ${ }_1^1 \mathrm{H}=1.0079 \mathrm{u}$ When 20 g of ${ }_3^{\prime} \mathrm{Li}$ is converted into ${ }_2^4 \mathrm{He}$ by proton capture, the energy liberated, (in kWh ), is [Mass of nucleon $=1 \mathrm{GeV} / \mathrm{c}^2$ ]