Question

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

Answer 1

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