20 cm 3 of hydrogen gas are sparked with 20cm 3 of oxygen gas in…

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Chemistry JAMB 1984

20 cm 3 of hydrogen gas are sparked with 20cm 3 of oxygen gas in an endimoeter at 373k (100 oC) and 1 atmosphere. The resulting mixture is cooled to 298 K (25 oC) and passed over calcium chloride. The volume of the residual gas is

  • 40 cm 3
  • 20 cm 3
  • 30 cm 3
  • 10cm 3 checkmark
  • 5cm 3

The correct answer is: D

Explanation

2H2 + O2 ------2H2O
2V 1V 2V
20cm3 20cm3 -------
20cm3 10cm3 20cm3
Residual gas = 20cm3 - 10cm3 of 02 = 103
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