Question

How many moles of water are produced when 5 moles of hydrogen gas react with 2 moles of oxygen gas?

Answer 1

Well a molecule of water is equal to 1 Oxygen and 2 Hydrogen each, so it'd be 2 molecules of water

Answer 2

Answer: Option (b) is the correct answer.

Explanation:

          $2H_{2} + O_{2} \rightarrow 2H_{2}O$

As it can be seen from the chemical equation, 2 moles of hydrogen reacts with 1 mole of oxygen.

Therefore, 2 moles of oxygen will react with 4 moles of hydrogen. So, oxygen is the limiting reagent and hydrogen is the excess reagent. Therefore, the reaction equation will be as follows.

           $4H_{2} + 2O_{2} \rightarrow 4H_{2}O$  

Thus, we can conclude that 4 moles of water are produced when 5 moles of hydrogen gas react with 2 moles of oxygen gas.