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?

1 Answer
anor277
May 28, 2017

Are you sure 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, HC≡CH, 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 US gallons.

So far as I know, and I try to avoid the use of whack units, 1 US gallon = 3.79⋅L. On the other hand, you might speak of Imperial Gallons = 4.54⋅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.

Moles of acetylene=0.35⋅g26.04⋅g⋅mol−1=1.34×10−2⋅mol.

And using the Ideal Gas Equation: P=nRTV

=1.34×10−2⋅mol×0.0821⋅L⋅atmK⋅mol×302⋅K5.7⋅gallons×3.79⋅L⋅gallon−1

=1.54×10−2⋅atm≡11.7⋅mm⋅Hg.

Anyway the whole question is pretty suspect.

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