Question

2 NH3 + 3 CuO → 3 Cu + N2 + 3 H2O

In the above equation, how many grams of N2 can be made when 12.2 moles of CuO are consumed?

Answer 1

114 grams N₂

Step-by-step explanation:

To find the answer, you need to (1) convert from moles CuO to moles N₂ (via the mole-to-mole ratio from equation) and then (2) convert from moles to grams (via molar mass from the periodic table). The final answer should have 3 sig figs according to the given value (12.2).

2 NH₃ + 3 CuO --> 3 Cu + 1 N₂ + 3 H₂O

Molar Mass (N₂): 2(14.01 g/mol)

Molar Mass (N₂): 28.02 g/mol

12.2 moles CuO 1 mole N₂ 28.02 grams
----------------------- x ----------------------- x ----------------------- = 114 grams N₂
3 moles CuO 1 mole N₂