# A neon gas in a sign has a volume of 42.5 L at 25 °C and 3.5 kPa. What is the mass of neon?

Jun 4, 2016

Approx. $1 \cdot g$.
$n = \frac{P V}{R T}$ $=$ $\frac{3.5 \times k P a \times 42.5 \cdot L}{8.314 \cdot L \cdot k P a \cdot {K}^{-} 1 \cdot m o {l}^{-} 1 \times 298 \cdot K}$
$=$ $6.00 \times {10}^{-} 2 \cdot m o l$
Thus $\text{mass neon}$ $=$ $6.00 \times {10}^{-} 2 \cdot m o l \times 20.18 \cdot g \cdot m o {l}^{-} 1$ $=$ ??g