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A mixture contains 20cm3 of hydrogen, 35cm3 of oxygen, 15cm3 of carbon monoxide and 10cm3...

Chemistry
JAMB 1982
A mixture contains 20cm3 of hydrogen, 35cm3 of oxygen, 15cm3 of carbon monoxide and 10cm3 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. 0.25
  • E. 20
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Correct Answer: Option D
Explanation
H2 = 20cm
O2 = 35cm
N2 = 10cm
CO = 15cm
Total vol = 80cm

Mole fraction of H2 = (20)/(80) = 0.25
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