0.817 grams of an unknown gas occupies 1.25 L at 27.0 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.

The gas is most likely methane (CH₄)

In general, the gas equation can be written  

where  

P = pressure, atm  

V = volume, liter  

n = number of moles  

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

T = temperature, Kelvin  

So the gas is most likely methane (CH₄ )

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a electronegativity decreases beacuse the size of nucleus is bigger.