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  4. 4.0 g of NaOH is dissolved in 100 mL solution. The normality of the solution is

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Q. $4.0\, g$ of $ NaOH $ is dissolved in $100 \,mL$ solution. The normality of the solution is

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Solution:

Normality $ =\frac{\text{gram equivalents of solute}}{\text{volume of solution in litre}} $
Given, mass of solute $ =4\,g $
Molecular mass of $ NaOH=23+16+1=40 $
Volume of solution $ =100\,mL=100/1000\,L $
$ =0.1\,L $
$ \therefore $ Normality $ =\frac{4/40}{0.1}=1.0N $