Question

Element: hydrogen symbol: H2 Molecular weight: g Mass of one mole: g/mol

Answer 1

What are you trying to say?
H2 's weight is 2.02
Mass per one mol is 1.01 g / mol

Answer 2

You can find this easily in the periodic table, look for hydrogen, then * mass by 2.

Answer 3

http://en.wikipedia.org/wiki/Molar_mass

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