Answer:
Step-by-step explanation:
General Remarks
The balance numbers are the same. (The balance numbers are 2 and 2)
The balance number in front of the O2 is 1.
So for every mole of O2 needed 2 moles of NO2 should be produced.
If 10.0 moles of oxygen is used, then you should get 20 mols of NO2 should be produced.
Formula
% yield = (what was produced / what should have been produced) *100
Givens
What was produced = 7 moles
What should have been produced = 20 moles
Solution
Substitute the givens into the equation
% yield = 8/20 * 100
% yield = 0.40 * 100
Answer: 40%