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WAEC Chemistry 2021 Objective — Question 33

Question 33 of 50 from the West African Examinations Council (WAEC) Chemistry 2021 Objective paper, with the correct answer and a full explanation.

33. What is the empirical formula of a hydrocarbon containing 0.160 moles of carbon and 0.640 moles of hydrogen?

A. CH2
B. CH3
C. CH4Correct
D. C2H4

Explanation

Dividing by the smaller value (0.16): C=1, H=4. Empirical formula is CH4.

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