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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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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