Bombardment of lithium with protons gives rise to the following reaction :
${ }_3{\mathrm{Li}}^7{+}_1{\mathrm{H}}^1\to 2\left({ }_2{\mathrm{He}}^4\right)+\mathrm{Q}$. Find the Q– value of the reaction. The atomic masses of lithium, proton and helium are 7.016 u, 1.008 u and 4.004 u respectively.