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?

0.02

0.16

0.20

0.25

Correct answer is D

H₂ = 20cm
O₂ = 35cm
N₂ = 10cm
CO = 15cm
Total vol = 80cm

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

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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?