JAMB Chemistry 2008 Objective — Question 43

Question 43 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2008 Objective paper, with the correct answer and a full explanation.

A hydrocarbon X with a molar mass of 92.3% carbon. What is its molecular formula?

A. C2H2B
B. C3H3
C. C4H4Correct
D. C5H5

Explanation

A hydrocarbon X with a molar mass of 26 consists of 92.3% carbon. Empirical formula = CH; molecular formula = (CH)n = 26; giving n=2, i.e. molecular formula C4H4 (per the working shown).

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