Find percent yield for crude and pure caffeine? Mass of Tea Leaves: 15.1808 gram

ID: 790570 • Letter: F

Question

Find percent yield for crude and pure caffeine?

Mass of Tea Leaves: 15.1808 grams

Recovered Crude Caffeine: 0.146 grams

Pure Caffeine: 0.057 grams

So when I do percent yield of the pure substance would it be 0.057g/0.146g*100 OR 0.057g/15.1808g*100

Or is this done differently by finding the using the reactants? Limiting reagent? Or can I do it this way?

If you need to reactants. I used 15.1808g tea, 500 mL DI water, 7.5g Calcium Carbonate, Dichloromethane, Magenesium Sulfate.

Find the percent yield of crude and pure trimyrisitn?

Mass of nutmeg: 5.054 grams

Crude trimyristin: 1.402 grams

Pure Trimyristin: 0.407 grams

Again for the pure percent yield do I do pure/crude*100 OR pure/total mass*100?

5.054 g Nutmeg, 50 mL dichloromethane, washed with (2)10 mL acetone.

Find the density of the known liquid?

Wt. of Pycnometer: 7.8625 grams

Wt. of Pycnometer +DI Water: 9.8876 grams

Wt. of Pycnometer + Known Liquid: 9.6235 grams

it will be the saame way

Pure Caffeine: 0.057 grams/Mass of Tea Leaves: 15.1808 grams

there is no need of reactants.

for the second case also same method is applied

pure yield=pure/total mass*100

crude yeild=crude/total mass*100

mass of known liquid=1.761g

mass of DI Water=2.0251

density=1.761/2.0251=0.8695

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