Answer : The number of moles of water formed can be, 128 moles
Solution : Given,
Moles of hydrogen gas = 138 moles
Moles of oxygen gas = 64 moles
First we have to calculate the limiting and excess reagent.
The balanced chemical reaction will be,
From the balanced reaction we conclude that,
As, 2 moles of hydrogen gas react with 1 mole of oxygen gas
So, 138 moles of hydrogen gas react with moles of oxygen gas
But the given moles of oxygen gas is 64 moles.
That means oxygen gas is a limiting reagent and hydrogen gas is an excess reagent.
Now we have to calculate the moles of water.
From the reaction we conclude that,
As, 2 moles of oxygen react to give 1 mole of water
So, 64 moles of oxygen react to give moles of water
Therefore, the number of moles of water formed can be, 128 moles