JAMB Chemistry 2017 Objective — Question 11

Question 11 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2017 Objective paper, with the correct answer and a full explanation.

10cm³ of hydrogen was sparked with 10cm³ of oxygen at s.t.p. Calculate the volume of the unreacted gas.

A. A. 15cm³
B. B. 20cm³
C. C. 5cm³Correct
D. D. 10cm³

Explanation

2H2 + O2 → 2H2O. 10cm³ H2 reacts completely with 5cm³ O2, leaving 10-5 = 5cm³ of unreacted oxygen.

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