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In this given reaction, 2 Moles of Hydrogen gas is reacting with 1 Mole of Oxygen gas to form 2 Moles of Water.

The answer is 3

The number of moles of the reactants in a chemical reaction is equal to the sum of the coefficients of all the reactants given in the balanced equation for the reaction. In the above reaction, the coefficient of H2 is 2 and the coefficient of O2 is 1. Hence, the total number of moles of the reactants is 3.

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