calculate the normality of 4g of sodium hydroxide in 100ml of solution

Answer 1

equivalents = grams/eq weight = 4/40 = ?
N = eq/L = ?

Answer 2

Equivalent weight=Mw÷valence
=40÷2
20g
1N:20g:1000ml
?:4g:100ml
So 1N:20g
?:4g
?=0.2N
Therefore 0,2N =2N