JAMB Chemistry 2011 Objective — Question 42

Question 42 of 49 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2011 Objective paper, with the correct answer and a full explanation.

An organic compound has an empirical formula CH2O and vapour density of 45. What is its molecular formula? [C=12,H=1,O=16]

A. A. C3H7OH
B. B. C2H5OH
C. C. C3H6O3Correct
D. D. C3H6O6

Explanation

Relative molecular mass = 2 x vapour density = 90. (CH2O)n = 90; (12+2+16)n = 90; 30n = 90; n = 3. Molecular formula = (CH2O)3 = C3H6O3.

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