1 g of hydrogen is converted into 0.993 g of helium in a thermonuclear reaction. The energy released is

$63 \times 10^7 J$ $63 \times 10^{10} J$ $63 \times 10^{14} J$ $63 \times 10^{20} J$

$63 \times 10^{10} J$

$\Delta m$ = 1 - 0.993 = 0.007 gm ∴ $E=(\Delta m) c^2=\left(0.007 \times 10^{-3}\right)\left(3 \times 10^8\right)^2=63 \times 10^{10} J$.