Hi, here I'm providing the answer for your question.
The formula to find molarity is, M= n/v
Where, M=molar concentration
n= moles of solute
v= litres of solution
4% (w/v) means 4gm of NaOH in 100ml
The molecular mass of NaOH is = 40
So molarity=4/40 * 1000/100 = 1M.
Therefore, the molarity is 1.0m
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