Answer
maximum anount of NH3 that can be formed: 5.905g
formula of the limiting reagent: H2
mass excess remains after the reaction is complete: 3.435g
Explanation
N2(g) + 3H2(g) ------> 2NH3(g)
Stoichiometrically, 1mole of N2 react with 3moles of H2
given moles of N2 = 8.29g/28.02g/mol = 0.29586mol
given moles of H2 = 1.05g / 2.02g/mol = 0.51980mol
0.29586mol of N2 require 0.885758moles of H2 but available moles of H2 is 0.51980mol ,so
limiting reagent is H2
stoichiometrically , 3 moles of H2 gives 2moles of NH3
number of moles of NH3 obtained by 0.51980moles of H2 = (2/3)× 0.51980mol = 0.34653mol
mass of NH3 formed = 0.34653mol × 17.04g/mol = 5.905g
0.51980moles of H2 react with 0.17327moles of N2
remaining moles of N2 after completion of reaction = 0.29586 mol - 0.17327mol = 0.12259mol
mass of N2 remaining after completion of reaction = 0.12259mol × 28.02g/mol = 3.435g
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