Answers:
D) 206. g
Step-by-step explanation:
We know we will need a balanced equation with masses and molar masses, so let’s gather all the information in one place.
M_r: 17.03 28.02
4NH₃ + 6NO ⟶ 5N₂ + 64H₂O
m/g: 100.
(1) Calculate the moles of NH₃
n = 100. g NH₃ ×1 mol NH₃/17.03 g NH₃
n = 5.872 mol NH₃
(2) Calculate the moles of N₂
The molar ratio is (5 mol N₂/4 mol NH₃)
n = 5.872 mol NH₃ × (5mol N₂/4 mol NH₃)
n = 7.340 mol
(3) Calculate the mass of N₂
Mass of N₂ = 7.340 mol N₂ × (28.02 g N₂/1 mol N₂)
Mass of N₂ = 206 g N₂
