JAMB Mathematics 2022 Objective — Question 20

Question 20 of 41 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2022 Objective paper, with the correct answer and a full explanation.

A hydrocarbon has an empirical formula CH and vapour density of 39. Determine its molecular formula.

A. C₆H₆Correct
B. C₂H₂
C. C₃H₃
D. C₁₂H₁₂

Explanation

M.M. = 2 × VD = 78. (CH)ₙ = 78. 13n = 78. n = 6. Molecular formula = C₆H₆ (benzene).

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