# What is the density of gaseous ethane, C_2H_6 at STP?

Apr 15, 2017

$1.3 g / L$ 1.3 grams per liter.

#### Explanation:

At STP the molar concentration is one mole per molar volume or Avogadro's volume of approximately 22.4 liters.

The molar mass is the sum of the atoms

$2 \times C = 2 \times 12 = 24 u$

$6 \times H = 6 \times 1 = 6 u$

$24 + 6 = 30 u$

So the density is $\frac{30 g}{22.4 L}$

or $1.3 g / L$