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Question

We allow 32.0 g of methane (CH4) to react as completely as possible with excess of O2 to form CO2 and H2O. How many moles of O2 will react?

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Solution

The balanced chemical equation for the combustion reaction is,
CH4+2O2CO2+2H2O
Thus, 1 mole of methane reacts with 2 moles of oxygen.
2 moles of methane (32.0 g) will react with 4 moles of oxygen.

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