Hello!

I would like to know if someone could tell me if that is right:

4 H+ + 4 eā + O2 ā 2 H2O

Q:How many grams of H have to react, in order to get 90g of H20?

My solution:

Ratio: 4:2

=> First "translate" H20 into moles: 90/18=5 moles

now, I created an equation, where x stands for grams of H: x* (1mol/4g H) = 5 mole

x=> 20.

now, we have two molecules of H20, which is why we have to divide 20/2, giving 10g of H.

Is that right?