How many molecules of hydrogen will be required to react completely with 0.600 mol of o2 in order to form water?

The  number  of  molecules  of hydrogen  that will be required   to react  completely  with  0.600 mol  of  O2  is  calculated  as  follows
equation  for  reaction

2H2+O2  = 2H2O
by  use  of  mole  ration of H2  to O2  (2:1)  the  moles  of H2  = 0.600 x2  = 1.2  moles

by  use of Avogadro  law   that is  1  mole =  6.02  x10^23  molecules  what about  1.2  moles

=  1.2 moles  x (6.02  x10^23)/  1mole= 7.224  x10^23 molecules

The answer should be vaporization