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*g)/(26.04*g*mol^-1)=1.34xx10^-2*mol#.

And using the #"Ideal Gas Equation: "P=(nRT)/V#

#=(1.34xx10^-2*molxx0.0821*(L*atm)/(K*mol)xx302*K)/(5.7*"gallons"xx3.79*L*"gallon"^-1)#

#=1.54xx10^-2*atm-=11.7*mm*Hg#.

Anyway the whole question is pretty suspect.

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