Chemistry - Stoichiometry - Limiting reagent concept - Identify the Limit

6 limiting reagent problems. P1: 'N₂ + 3H₂ → 2NH₃. 28g N₂ + 9g H₂. Limiting reagent: ___, Product mass: ___g NH₃' (H₂ is limiting - 4.5mol H₂ needs 1.5mol N₂ but gives only 3mol NH₃=51g; Actually: 9g H₂ = 4.5mol, needs 1.5mol N₂. 28g N₂ = 1mol. Ratio needs 1:3, have 1:4.5, so N₂ is limiting! 1mol N₂