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  4. The percentage by weight of hydrogen in H2O2 is

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Q. The percentage by weight of hydrogen in $H_{2}O_{2}$ is

Hydrogen

Solution:

Mol. mass of $H_{2}O_{2} = \left(2 \times 1\right) + \left(2 \times 16\right) = 34$
Percentage of hydrogen $= \frac{2}{34} \times100 =5.88\%$