2. Given that you have calculated the theoretical yield possible from two or mor

Question

2. Given that you have calculated the theoretical yield possible from two or more starting reagents, which compound is the limiting reagent?

Select one:

a. the reagent that gives the lowest theoretical yield

b. there is no limiting reagent

c. the reagent that gives the greatest theoretical yield

d. the reagent that gives the greatest theoretical yield and is not just a catalyst

e. the reagent that gives the lowest theoretical yield and is not just a catalyst

3. What is the % yield of the reaction making 2.4 g of acetyl salicylic acid from 8.8 g of salicylic acid, 9.0 mL of acetic anhydride (density 1.082), and 10 drops 85 % weight phosphoric acid (density 1.685)? Use the molecular weights that you have already calculated. Give two significant figures.

4. What is the % yield of the reaction making 2.4 g of acetyl salicylic acid from 8.8 g of salicylic acid, 9.0 mL of acetic anhydride (density 1.082), and 10 drops 85 % weight phosphoric acid (density 1.685)? Use the molecular weights that you have already calculated. Give two significant figures.

Explanation / Answer

Ans 2 a) The reagent that gives lowest theoretical yield.

The reagent that gives the lowest theoretical yield indicates that it is the limiting reagent in the reaction which stops the reaction from going further and produce more product.

If the yield is calculated from the other reagents , it comes out to be more , but in actual it is not possible.

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