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MCAT Question A Day - 10/30/14 - Answer!

A 13 gram gaseous sample of an unknown hydrocarbon occupies a volume of 11.2 L at STP. What is the hydrocarbon?

A.  CH
B.  C2H4
C.  C2H2
D.  C3H3

C is correct. You should recognize that 1 mole of gas occupies 22.4 liters at STP, so there is 0.5 moles of gas in the sample. 13 g / 0.5 mol ~ 26 g/mol

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