Chemistry help plzzzzzzz?

what is the normality of a solution 100g HNO3 in 500ml of solution?

a, 1.26 b, 1.59 c, 3.17 d,0.5 e, 0.63

Answer:
N=100 X 1000/63X500

=1.59
ans : c)3.17

normality=(100/63(atomic mass of HNO3))/(500/1000)=3.17

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