# How to calculate the number of moles of hydrogen atoms?

Mar 13, 2017

The molecular formula of methane ($C {H}_{4}$) suggests that one molecule of this compound consists of 4 atoms of H.

So 1 mole of $C {H}_{4}$ will have 4 mol atom of Hydrogen.

Now number of moles of $C {H}_{4}$ in $5.2 \times {10}^{24}$ molecules is

$= \frac{5.2 \times {10}^{24}}{\text{Avogadro's number}}$

So the number of moles of H atom in it

$= \frac{4 \times 5.2 \times {10}^{24}}{\text{Avogadro's number}}$

$= \frac{4 \times 5.2 \times {10}^{24}}{6.024 \times {10}^{23}} \approx 34.5 m o l$ atom