JAMB Biology 2015 Objective — Question 47

Question 47 of 50 from the Joint Admissions and Matriculation Board (JAMB) Biology 2015 Objective paper, with the correct answer and a full explanation.

Calculate the molecular formula of a compound with empirical formula CH₂O and relative molecular mass 120. [C=12, O=16, H=1]

A. C₂H₄O₂
B. C₄H₈O₄Correct
C. C₆H₁₆O₆
D. C₈H₁₆O₈

Explanation

Empirical formula mass = 12+2+16 = 30. n = 120/30 = 4, so molecular formula = (CH₂O)₄ = C₄H₈O₄.

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