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Question

For the reaction,
2H2(g)+O2(g)2H2O(g)
Initially, 3 moles of H2 and 2 moles of O2 are present. Identify the correct statement.

A
H2 is the limiting reagent
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B
O2 is the limiting reagent
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C
1 mol of O2 is left unreacted
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D
1 mol of H2 is left unreacted
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Solution

The correct option is A H2 is the limiting reagent
2H2(g)+O2(g)2H2O(g)

Between H2 and O2, the limiting reagent would be the one that has a smaller ratio of available moles to the stoichiometric coefficients.

For H2, moles of H2coefficient=32=1.5

Similarly, for O2, moles of O2coefficient=21=2

Limiting Reagent is H2
0.5 mol of O2 is left unreacted.

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