Post-UTME Chemistry 2013 Objective — Question 8

Question 8 of 22 from the Post-UTME Screening (Post-UTME) Chemistry 2013 Objective paper, with the correct answer and a full explanation.

If 100cm3 of oxygen passes through a porous plug in 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is

A. 10.0s
B. 12.5sCorrect
C. 17.7s
D. 32.0s

Explanation

By Graham's law, rate is inversely proportional to sqrt(molar mass). t(H2) = t(O2) x sqrt(M(H2)/M(O2)) = 50 x sqrt(2/32) = 50/4 = 12.5s. (No printed answer key for this session; answer worked out independently.)

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