N2 + 3H2 ==> 2NH3
mols H2 = grams/molar mass = ?
Convert mols H2 to mols NH using the coefficients in the balanced equation. That's ?mols H2 x (2 mols NH3/3 mols H2) = ?
Then convert mols NH3 to grams. g = mols x molar mass = ?
calculate number of moles of NH3 if 8g of H2 reacts in excess N2
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