Question

d 1.43 grams of caffeine from 10 tea bags. If each tea bag weighs 3.3 grams, what is the percent yield caffeine in the tea. 7. If the density of a certain liquid material is 1.27 gyml, caleulate the volume of the material that would be equivalent to 10 grams of the materials. The melting point of a pure compound is known to be 110-111°. Describe the melting behavior expected if this compound is contaminated with a 10 % impurity. 8. 9. You melt a compound and observe decolorization, but miss the melting point. Should you cool the sample and re-melt it, or start over? Explain You attempt to melt a compound and it disappears: what should you do? What may be occurring for the sample to disappear? 10. You and your lab partner take melting points of the same sample. You observe a melting point of 101-107°C, while your partner observes a value of i 10-112C, explain how you can get two different values with exactly the same sample. 11. 12. A compound melting at 134°C was supposed to be either aspirin (mp 134°C) or urea (mp 135 °C). Explain how you could determine whether one of these two suspected compounds was identical to the unknown compound using melting point data alone? unknown compound gave a melting point of 230 °c. When the molten liquid possible explanation. 13. A the melting point was re-determine and found to be 131°C. Give a
Organic chemistry

Answer 1

Ans 6 :

Percent yield = (amount isolated / total amount) x 100

Total amount = 3.3 x 10 = 33 grams

So putting all the values , we get :

Percent yield = (1.43 / 33) x 100

= 4.33%

So the percent yield of caffiene is 4.33%