How many moles of H_2 are needed to produce 13.27g of NH_3?

Answer 1

well one mole of NH3 has 3 moles of H
1 mole of H2 has 2 moles of H

each mole of NH3 requires 3/2 moles of H2
mol wt of NH3 = 14 + 3*1 = 17

so you need 3/2 * (13.27 / 17) = 1.17