Question

If $2g$ of hydrogen is converted into $1.986gm$ Helium in a thermonuclear reaction, the energy released is

• A. 63 X 10${}^{7}J$
• B. 63 X 10${}^{10}J$
• C. 126 X 10${}^{10}J$
• D. 6.3 X 10${}^{20}J$

Answer 1

Answer: (C)

126 X 10${}^{10}J$

$\Delta m=2-1.986$ $=0.014gm$

$\Delta E=\left(\frac{0.014}{1000}Kg\right)\times (3\times {10}^8{)}^2$$=126\times {10}^{10}J$