The limiting reagent in this reaction is hydrogen because it is the reactant that is used up first.
The balanced equation for the reaction between hydrogen and oxygen to form water is:
2H2 + O2 -> 2H2O
To react 10 moles of hydrogen with 6 moles of oxygen, we will also need 6 moles of oxygen.
Since we have enough hydrogen and oxygen to react completely, we can calculate the number of moles of water produced.
10 moles of H2 will react to produce 10 moles of H2O and 6 moles of O2 will react to produce 3 moles of H2O. Therefore, the total amount of water produced is 10 + 3 = 13 moles of water.