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How many grams of H2 are needed to produce 12.22g of NH3?

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IF you are using the equation of
N2 + 3H2 ==> 2NH3 (if not this won't work)
mols NH3 = grams/molar mass
mols H2 = mols NH3 x (3/2) = ?
Then g H2 = mols H2 x molar mass H2 = ?
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