The strengths of 5.6 volume hydrogen peroxide

Question:

The strengths of $5.6$ volume hydrogen peroxide (of density $1 \mathrm{~g} / \mathrm{mL}$ ) in terms of mass percentage and molarity (M), respectively, are:

(Take molar mass of hydrogen peroxide as $34 \mathrm{~g} / \mathrm{mol}$ )

  1. $1.7$ and $0.25$

  2. $1.7$ and $0.5$

  3. $0.85$ and $0.5$

  4. $0.85$ and $0.25$


Correct Option: , 2

Solution:

Volume strength $=11.2 \times$ molarity

$\Rightarrow$ molarity $=\frac{5.6}{11.2}=0.5$

Assuming 1 litre solution;

mass of solution $=1000 \mathrm{ml} \times 1 \mathrm{~g} / \mathrm{ml}=1000 \mathrm{~g}$

mass of solute $=$ moles $\times$ molar mass

$=0.5 \mathrm{~mol} \times 34 \mathrm{~g} / \mathrm{mol}$

$=17 \mathrm{gm} .$

$\Rightarrow \operatorname{mass} \%=\frac{17}{1000} \times 100=1.7 \%$

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