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Answer 1

N₂(g) + 3H₂(g) ==> 2NH₃(g)

xs.......2.70 g.............? g

We need to convert g to moles and then back to grams.

moles H₂ present = 2.70 g H₂ x 1 mol/2 g = 1.35 moles H₂

moles NH₃ produced = 1.35 mol H₂ x 2 moles NH₃/3 moles H₂ = 0.90 moles NH₃ formed

grams NH₃ produced = 0.90 moles NH₃ x 17 g/mole = 15.3 g NH₃ produced