Question

If mass can neither be created nor be destroyed in a chemical reaction then how energy released in nuclear fusion is counted on mass destroyed or lost

Answer 1

Nuclear fusion is not a chemical reaction, so you cannot apply the law there. It is partially Physics and partially Chemistry, but comes under physics because it deals with mass and energy. Fusion is a physical process in which we "create" mass, not "destroy".
Mass-energy equivalent was given by Einstein, which is very very famous:—

$E= m {c}^{2}$
where m is mass "created" or "destroyed" and c is speed of light constant, which is approx.
$= 3 * {10}^{8} m/s$

Answer 2

Answer:

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