WAEC Chemistry 2019 Objective — Question 9
Question 9 of 50 from the West African Examinations Council (WAEC) Chemistry 2019 Objective paper, with the correct answer and a full explanation.
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Which of the following pairs of compounds have the same molecular mass? [H=1.0, C=12.0, O=16.0]
- A. Ethene and ethyne
- B. Ethane and ethene
- C. Carbon(II) oxide and ethyneCorrect
- D. Carbon(IV) oxide and ethyne
Explanation
Carbon(II) oxide (CO) = 12+16 = 28. Ethyne (C2H2) = 24+2 = 26. Actually the matching pair is Carbon(II) oxide (28) and Ethene (C2H4 = 28); both equal 28 g/mol.
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