# 0.35 g of Nonyne gas was exposed to a temperature of 29 degrees C and a volume of 5.7 gallons. How much pressure does this exert?

May 28, 2017

Are you sure $\text{nonyne}$ is a gas.........?

#### Explanation:

I don't have an Aldrich or Acros catalogue handy. But I am pretty sure that the isomeric nonynes would be distillable liquids (if they are available commercially!). I will assume that you speak of acetylene, $H C \equiv C H$, which is certainly a room temperature gas, and answer the question on this basis. There is also another assumption I must make; that is that you speak of $\text{US gallons}$.

So far as I know, and I try to avoid the use of whack units, $\text{1 US gallon}$ $=$ $3.79 \cdot L$. On the other hand, you might speak of $\text{Imperial Gallons}$ $=$ $4.54 \cdot L$ (I would certainly use the latter unit here in the UK!). This confusion nicely illustrates why scientists (and syllabuses) should use non-ambiguous, standard units.

$\text{Moles of acetylene} = \frac{0.35 \cdot g}{26.04 \cdot g \cdot m o {l}^{-} 1} = 1.34 \times {10}^{-} 2 \cdot m o l$.

And using the $\text{Ideal Gas Equation: } P = \frac{n R T}{V}$

$= \frac{1.34 \times {10}^{-} 2 \cdot m o l \times 0.0821 \cdot \frac{L \cdot a t m}{K \cdot m o l} \times 302 \cdot K}{5.7 \cdot {\text{gallons"xx3.79*L*"gallon}}^{-} 1}$

$= 1.54 \times {10}^{-} 2 \cdot a t m \equiv 11.7 \cdot m m \cdot H g$.

Anyway the whole question is pretty suspect.