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  4. A compound (molar mass =120g ) contains 40 % carbon by mass. If the ratio of number of H and O atoms in the compound is 2:1 , then number of H -atoms in one molecule of the compound is :-

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Q. A compound (molar mass $=120g$ ) contains $40\%$ carbon by mass. If the ratio of number of $H$ and $O$ atoms in the compound is $2:1$ , then number of $H$ -atoms in one molecule of the compound is :-

NTA AbhyasNTA Abhyas 2020

Solution:

Mass of $C=120\times \frac{40}{100}=48g$
Suppose number of $H$ and $O$ atoms are $2x$ and
$x,$ then,
$48+2x\times 1+x\times 16=120$
$18x=72$
$x=4$