JAMB Chemistry 2014 Objective — Question 44

Question 44 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2014 Objective paper, with the correct answer and a full explanation.

A hydrocarbon has an empirical formula CH and a vapour density of 39. Determine its molecular formula. [C=12, H=1]

A. C₆H₆Correct
B. C₂H₂
C. C₃H₃
D. C₄H₄

Explanation

Molar mass = 2×39=78. Empirical formula mass CH=13. n=78/13=6. Molecular formula=(CH)6=C6H6.

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