Answer:
189.5
Explanation:
its very very very very easy
Answer:
Option 2, 3, and also 6 btw
Explanation:
The other guy was wrong
See the correct answer is b.)PbS
Yes. Percent yield shows how efficient one's method is. If his isolated caffeine proved to be at only 1.5%, compared to least 50% as in many of the previous experiments, the student should be very concerned as it shows that something caused the yield to sharply drop.
