JAMB Chemistry 2018 Objective — Question 8

Question 8 of 36 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2018 Objective paper, with the correct answer and a full explanation.

An organic acid contains 40% carbon, 6.6% hydrogen and 53.33% oxygen. Determine its empirical formula

A. C₂H₄O₂
B. CHO₂
C. CH₂OCorrect
D. C₄H₂O

Explanation

Moles: C=40/12=3.33, H=6.6/1=6.6, O=53.33/16=3.33. Ratio C:H:O = 3.33:6.6:3.33 = 1:2:1, giving empirical formula CH₂O.

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