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According to the following chemical equation:

N2 + 3H2 → 2NH3

How many grams of hydrogen are needed to completely react with 28.0 grams of nitrogen?

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According to the equation, 1 mol N2 reacts with 3 mols H2.
mols N2 = g/molar mass = 28/28 = 1
That will take 3 mols H2.
grams H2 = mols H2 x molar mass H2 = ?

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