A gas occupies 2.7liters and weighs 1.72 at STP. What is the molecular weight?

i need the answer in g/mol

Answer:
We use the equation
pV = nRT
at STP
T = 273 K
p = 1 atm
n = pV / RT = 1 x 2.7 / 0.0821 x 273 = 0.120 ( number of moles )
1 mole weights ( x )grams = 0.120 moles weights 1.72 g

The molecular weight is 1.72 / 0.120 = 14.2 g /mol
(may be CH4)

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