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

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant. 

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