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$\large\frac{2}{3}$ of the atoms in water molecule are hydrogen .What % weight of a water molecule is the weight of 2 hydrogen atoms:

$\begin{array}{1 1}(a)\;5.6\%&(b)\;11.1\%\\(c)\;22.4\%&(d)\;33.3\%\end{array}$

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18g $H_2O$ has $2g \;H$
$\therefore 100g H_2O$ gas $\large\frac{2\times 100}{18}$=11.1%H
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