Ammonia gas can be prepared by the reaction CaO(s) + 2NH₄Cl(s) → 2NH₃(g) + H₂O(g) + CaCl₂(s). In an experiment, 30.1g of ammonia gas, NH₃, is produced when it was predicted that 54g would be produced. What is the percent yield?
a) 55.7%
b) 44.2%
c) 66.2%
d) 38.8%