To find out how many moles of water can be made from 4 moles of oxygen gas and 16 moles of hydrogen gas, we need to determine the limiting reagent.
From the balanced equation 2H2 + O2 โ 2H2O, we can see that 2 moles of hydrogen gas react with 1 mole of oxygen gas to produce 2 moles of water.
First, letโs calculate how much hydrogen gas is required to react with the given amount of oxygen gas:
1 mole of oxygen gas requires 2 moles of hydrogen gas.
Therefore, 4 moles of oxygen gas will require 8 moles of hydrogen gas.
Since we have 16 moles of hydrogen gas, which is more than enough, hydrogen gas is in excess. Thus, the limiting reagent is oxygen gas.
Now, letโs calculate how much water can be produced:
1 mole of oxygen gas will produce 2 moles of water.
Therefore, 4 moles of oxygen gas will produce 8 moles of water.
So, from 4 moles of oxygen gas and 16 moles of hydrogen gas, we can make 8 moles of water.