# Question #ee169

Oct 30, 2016

You have done well except molar mass of hydrogen gas ${\text{H}}_{2}$, should be doubled as it has two atoms. The answer goes as below

#### Explanation:

Use the formula
Density $d = \text{Molar mass} \times \frac{P}{R T}$

$\text{Molar mass} = 2 \times 1.00794 = 2.01588 g$
$P = 1645 \times 0.068046 = 111.93567 a t m$
$R = 0.08206$
$T = 273.15 + 24.0 = 297.15 K$

Inserting the values in the formula:

$d = 2.01588 \times \frac{111.93567}{0.08206 \times 297.15}$

$d = 9.2 g / L$, rounded to one decimal place.