JAMB Biology 2015 Objective — Question 23

Question 23 of 50 from the Joint Admissions and Matriculation Board (JAMB) Biology 2015 Objective paper, with the correct answer and a full explanation.

What is the molecular formula of a compound with empirical formula CH₂ and vapour density 42? [C=12, H=1]

A. C₆H₁₂Correct
B. C₃H₆
C. C₄H₈
D. C₅H₁₀

Explanation

Molar mass = 2×vapour density = 84. Empirical formula mass (CH₂) = 14. n = 84/14 = 6, so molecular formula = C₆H₁₂.

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