How many moles of methane gas are required to produce 9 moles of water when it combusts in the presence of excess oxygen gas. The other product is carbon dioxide

The answer to your question is 4.5 moles of CH₄ are necessary to produce 9 moles of water.

Explanation:

Data

moles of methane = ?

moles of water = 9

moles of oxygen = excess

Balanced chemical reaction

               1 CH₄  +  2O₂  ⇒  CO₂  + 2H₂O

Process

1.- Use proportions to find the moles of Methane and consider the coefficients of the balanced chemical reaction.

              1 mol of CH₄ 2 moles of H₂O

                x                   9 moles of H₂O

                x = (9 x 1) / 2

                x = 9/2

                x = 4.5 moles of CH₄

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