How many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 88.1 moles of water vapor?

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The relevant chemical reaction can be written as:

`CO_2 + 4H_2 -> CH_4 + 2H_2O`

In this reaction, carbon dioxide reacts with hydrogen to form methane and water. This reaction is known as the Sabatier reaction and is very commonly used to generate methane for fuel.

(The entire section contains 134 words.)

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