# What is the mass of a sample of neon gas if the volume is 10 L at STP?

Jul 25, 2018

Well $\text{STP}$ specifies $100 \cdot k P a$ and $273.15 \cdot K$...

#### Explanation:

And so we solve for ${n}_{\text{moles of gas}}$ in the Ideal Gas equation, and of course we have to fish out an appropriate gas constant...

$n = \frac{P V}{R T} = \frac{100 \cdot k P a \times 10 \cdot L}{8.314 \cdot L \cdot k P a \cdot {K}^{-} 1 \cdot m o {l}^{-} 1 \times 273.15 \cdot K}$

$= 0.440 \cdot m o l$

And thus a mass of $0.440 \cdot m o l \times 20.18 \cdot g \cdot m o {l}^{-} 1$...approx. $9 \cdot g$...