Step-by-step explanation:
When 3 moles of hydrogen gas react with 2 moles of oxygen gas, they will produce 2 moles of water (H2O). The balanced chemical equation for this reaction is:
2H2 + O2 -> 2H2O
It can be seen that 2 moles of hydrogen react with 1 mole of oxygen to form 2 moles of water. Therefore, when 3 moles of hydrogen gas react with 2 moles of oxygen gas, they will produce 2 moles of water.