Post-UTME Chemistry 2018 Objective — Question 9
Question 9 of 21 from the Post-UTME Screening (Post-UTME) Chemistry 2018 Objective paper, with the correct answer and a full explanation.
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A mixture contains 20cm^3 of hydrogen, some oxygen, 15cm^3 of carbon monoxide and 10cm^3 of nitrogen at S.T.P. Which of the following gives the mole fraction of hydrogen in this mixture?
- A. 0.02
- B. 0.16
- C. 0.20
- D. 0.25Correct
Explanation
Mole fraction = volume of H2 / total volume. With the oxygen volume as printed in the source, the total works out to 80cm^3, giving 20/80 = 0.25. Flagged: the oxygen volume figure was not fully legible in the scan.
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