Question

How many moles of water would be produced when you combine 4 moles of hydrogen and 4 moles of oxygen?

Answer 1

4 moles of water.

Explanation:

Formation of water is given by:
`2"H"_2+"O"_2->2"H"_2"O"`

or

`4"H"_2+2"O"_2->4"H"_2"O"`

We have the 4 moles of oxygen but only 4 moles of hydrogen, instead of 8. So, the 4 moles of hydrogen reacts with 2 moles of oxygen, to give 4 moles of water.