2. Bromine can be added to limonene to create a brominated compound.
The balanced equation is shown below. When 613 mg of limonene and
3.5 mL of a 10% (v/v) solution of Br2 in dichloromethane (a solvent) are
combined, 959 mg of the product is isolated. Calculate the percent yield
for this reaction.
3. If the limonene reactant described in question 2 is composed of a single
enantiomer, would you expect the product to be a single enantiomer or
racemic? Explain. (Donʼt overthink the question!)
For the first 2, convert products and reactants to moles and then see how many moles you put in vs how many moles you get out. this will give you your % yield.
*I meant to say for NUMBER 2.
.... try :
.613g/136.23g/mol=.004999mol
.959g/296.04g/mol=.003239mol
Divide:
.003239/.004999 then *100% = Percent yield
=72% yield?
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To calculate the percent yield for the reaction in question 2, we need to determine the theoretical yield and the actual yield.
First, let's calculate the theoretical yield:
1. Convert the mass of limonene to moles by dividing 613 mg by the molar mass of limonene.
2. Determine the limiting reactant by comparing the moles of limonene to the moles of bromine (using the balanced equation).
3. Use the stoichiometry of the balanced equation to calculate the moles of the product that should form.
4. Convert the moles of product to the mass of the product by multiplying by the molar mass of the product.
Now, let's calculate the actual yield:
1. Convert the volume of the 10% solution of Br2 to moles of Br2 by multiplying by the density of the solution and dividing by the molar mass of Br2.
2. Determine the limiting reactant by comparing the moles of limonene to the moles of Br2 (using the balanced equation and stoichiometry).
3. Use the stoichiometry of the balanced equation to calculate the moles of the product based on the limiting reactant.
4. Convert the moles of product to the mass of the product by multiplying by the molar mass of the product.
After calculating the theoretical and actual yields, you can use the following formula to calculate the percent yield:
Percent yield = (actual yield / theoretical yield) x 100
For question 3, if the limonene reactant is composed of a single enantiomer (chiral molecule), the product is expected to be a single enantiomer as well. This is because the bromination of limonene involves breaking and forming bonds, but it does not specifically generate a mechanism that changes the stereochemistry or creates an achiral center. Therefore, the product should retain the same stereochemistry as the starting material.