Question

2H2 + O2 + 2H2O
How many moles of oxygen are needed to produce 10 L of H2O at STP?

Answer 1

V=10 l H2O

VM=22.4 l/mole

n=V/Vm=0.446 moles H2O

the ratio 1:2

x:0.446

x=0.223 moles O2