In the nuclear reaction ${ }_1{\mathrm{H}}^2{+}_1{\mathrm{H}}^2{\to }_2{\mathrm{He}}^3{+}_0{\mathrm{n}}^1$ If the mass of the deuterium atom=2.014741 amu, mass of ${ }_2{\mathrm{He}}^3$ atom =3.016977 amu and mass of neutron=1.008987 amu, then the Q value of the reaction is nearly.