Answer:
Percentage yield = 92.86%
Step-by-step explanation:
We are given;
Actual yield = 3.9 grams
Theoretical yield = 4.2 grams
Formula for percent yield is;
% yield = (actual yield/theoretical yield) × 100%
Thus;
% yield = (3.9/4.2) × 100%
% yield = 92.86%