Posted by Mae on Wednesday, October 3, 2012 at 7:18am.
The molar mass of H2 is 2.02 grams
1.25/2.02 is the number of moles of H2
multiply the number of moles of H2 by Avogadro's number, and you have the number of molecules of H2
multiply the number of molecules of H2 by 2 and you have the number of atoms of H
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