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0.817 grams of an unknown gas occupies 1.25 L at 27.0 ï‚°C and a pressure of 765
mm Hg. Is the gas most likely methane (CH 4 ), ethane (C 2 H 6 ), propane or butane?
Show work to support your answer.

Respuesta :

ardni313

The gas is most likely methane (CHâ‚„)

Further explanation

In general, the gas equation can be written  

[tex]\large{\boxed{\bold{PV=nRT}}}[/tex]

where  

P = pressure, atm  

V = volume, liter  

n = number of moles  

R = gas constant = 0.08205 l.atm / mol K  

T = temperature, Kelvin  

[tex]\tt PV=\dfrac{mass}{M}RT\\\\M=\dfrac{mRT}{PV}=\dfrac{0.817\times 0.082\times 300}{1,00658\times 1.25}=15.97\approx=16[/tex]

So the gas is most likely methane (CHâ‚„ )

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