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Question

How many moles of H2 will be needed to produce 6 moles of H2O when it reacts with excess of O2 ?
  1. 3
  2. 4
  3. 6
  4. 5


Solution

The correct option is C 6
The balanced chemical equation can be written as, 
2H2  +  O2    2H2O
2 mol   1 mol     2 mol 
So, to form 6 moles of H2O, 6 moles of H2 will be required.

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