# How many hydrogen atoms are present in 25.3 grams of methane?

Jul 21, 2017

Approx. $4 \times {10}^{24}$ hydrogen atoms............

#### Explanation:

We work out the molar quantity of methane.....

$\text{Moles of methane} = \frac{25.3 \cdot g}{16.04 \cdot g \cdot m o {l}^{-} 1} = 1.584 \cdot m o l$.

And since there are 4 mole of hydrogen ATOMS per mole of methane......we gots......

$1.584 \cdot m o l \times 4 \cdot m o l \cdot H \cdot m o {l}^{-} 1 \cdot \text{methane}$

$6.33 \cdot m o l$ $\text{hydrogen atoms......}$

And an actual number of......

$6.33 \cdot m o l \times 6.022 \times {10}^{23} \cdot m o {l}^{-} 1 = \text{How many hydrogen atoms?}$