100 cm3 of oxygen is made to react with 50 cm 3 of hydrogen, and…

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Chemistry JAMB 1982

100 cm3 of oxygen is made to react with 50 cm 3 of hydrogen, and the whole reaction mixture was then passed through anhydrous calcium chloride. What is the volume of gas left?

  • 5 cm3
  • 25 cm3
  • 50 cm3
  • 75 cm3 checkmark
  • 100 cm3

The correct answer is: D

Explanation

2H2 + O2 → 2H2O
2V3 1V3 2V
50cm 100 —
50cm 25cm3 50cm3
Volume of gas left = (100 - 25)cm3 of O2 = 75 cm3 of O2
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