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JAMB Chemistry 2020 Objective — Question 34

Question 34 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2020 Objective paper, with the correct answer and a full explanation.

34. What volume of oxygen is present in 500cm3 of air?

A. A. 21cm3
B. B. 105cm3Correct
C. C. 390cm3
D. D. 141cm3

Explanation

Air is approximately 21% oxygen by volume. 21% of 500cm3 = 105cm3.

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