JAMB Chemistry 2013 Objective — Question 50

Question 50 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2013 Objective paper, with the correct answer and a full explanation.

An organic compound contains 60% carbon, 13.3% hydrogen and 26.7% oxygen. Calculate the empirical formula.

A. C2H5O2
B. C2H6O
C. C3H12O
D. C3H8OCorrect

Explanation

Moles: C = 60/12 = 5, H = 13.3/1 = 13.3, O = 26.7/16 = 1.67. Dividing by the smallest (1.67): C = 3, H = 8, O = 1. Empirical formula = C3H8O.

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