An unknown gaseous hydrocarbon consists of 85.63% carbon by mass.A 0.959-g sample of the gas occupies a volume of 0.51 L at STP.What is the identity of the gas? A)C₃H₆ B)C₄H₈ C)C₅H₁₀ D)CH₂ E)C₂H₄

Question

Quizplus · Accepted Answer

The molar mass of the gas is:(0.959 g) / (0.51 L) * (22.4 L/mol) = 42.0 g/molThe empirical formula of the gas is:(85.63 g C/mol) / (12.01 g/mol) = 7.13 C(14.37 g H/mol) / (1.01 g/mol) = 14.2 HThe molecular formula of the gas is:C7H14The correct answer is A) C3H6.

An Unknown Gaseous Hydrocarbon Consists of 85