Question

If 3.00 moles of water are produced, how many moles of oxygen must be consumed?

Answer 1

I assume you are talking about the formation of water from its elements. If this is not true the following may need to be modified.
2H2 + O2 ==> 2H2O
3.00 mols H2O x (1 mol O2/2mol H2O) = ??

Answer 2

Didn't we just do this?

Answer 3

hji

Answer 4

10