Experiment 10: Microwave Chemistry-Synthesis of Phenytoin (Data Sheet) Running the reaction 0.70 g of urea, 1.30 g of benzil, and 0.61 g of sodium hydroxide were ground together in a mortar yielding a yellow power The mixture was transferred to a 25 mL beaker After covering the beaker with a watch glass, it was placed in the microwave and heated for 90 seconds with 280 Watt • The mixture melted and turned pale yellow Product isolation After cooling, the mixture is transferred to a mortar and ground into a powder The solids were extracted twice with 5 mL of 95 % ethanol The combined organic layers were placed in a beaker and 4 mL of 6 M HCl added dropwise; the pH value was below pH=2 and a white precipitate was formed The solids were isolated by vacuum filtration using a Hirsch funnel and rinsed with 2 mL 95 % ethanol The crude was recrystallized from 10 mL of ethanol:water (8:2) The fine needles were isolated by vacuum filtration using a Hirsch funnel and rinsed with 1 mL 95 % ethanol Product characterization 1.65 g of the crude product 1.25 g of the final product • M.p.: 296.5-299.2 °C

Calculate limiting reagent and percent yield

Choose the key item that must be determined experimentally in order to calculate the percent yield as follows     Mol of product, or heat evolved, theoretical yield or

A student performed a chemical reaction that had calculated theoretical yield of 35.0grams. However, the student measured an actual yield of 32.5 grams. Calculate the percent yield?

1.99 g H2 is allowed to react with 10.3 g N2, producing 2.24 g NH3- Part A What is the theoretical yield in grams for this reaction under the given conditions? Express your answer to three significant figures and include the appropriate units. • View Available Hint(s) HÀ ? Value Units Submit Previous Answers

BACKGROUND KNOWLEDGE: The reaction performed is the precipitation of calcium hydroxide from solutions of calcium chloride and potassium hydroxide. The percentage yield of calcium hydroxide is 98.97% QUESTION: Comment on your calculated percentage yield and the main sources of error in this experiment.

How to calculate percent yield

question → Can you calculate percent and theoretical yield? Final Eugenol mass: 127.13g - 126.2g = 0.93g Eugerol CHO carbon 12.011 x 10 = 120.01 Hydrogen 1.0078 x 12 = 12.0936 = 164.1016= Molar mass of 10 12 2 Eugenol oxygen 15.999 x 2 = 31.998 moks of Eugerol = 0.00566722 p 0.93 0.93 164.1016 = 0.00566722 + 10.0g = 0.0851 0.93 G

What is the computation for the theoretical yield of benzoic acid?

The maximum amount of product that can be obtained under the given experimental conditions theoretical yield actual yield O percent yield limiting reagent excess reagent