1. How many moles are in 9.6 mL of acetic anhydride, density of 1.082? Give two

Question

1. How many moles are in 9.6 mL of acetic anhydride, density of 1.082? Give two significant figures. Given molecular weight: 102 g

2. As a "rule of thumb" there are 20 drops of a liquid in a mL. Using this estimate and a density of 1.685, how many moles are in 9 drops of 85 % by weight phosphoric acid? Give two significant digits. Given molecular weight: 98 g

3. Starting with 9.6 g of salicylic acid, how many grams of acetylsalicylic acid (theoretical yield) can be made? Assume salicylic acid is the limiting reagent and a one to one stoichiometry. Give two significant digits. Given mole

4. Starting with 2.8 mL of acetic anhydride with a density of 1.082, how many grams of acetylsalicylic acid (theoretical yield) can be made? Assume acetic anhydride is the limiting reagent and a one to one stoichiometry. Give two significant digits. Given molecular weight of acetylsalicylic acid: 180 g. Given molecular weight acetic anhydride: 102 g

5. What is the % yield of the reaction making 3.3 g of acetyl salicylic acid from 8.9 g of salicylic acid, 5.6 mL of acetic anhydride (density 1.082), and 10 drops 85 % weight phosphoric acid (density 1.685)? Use given molecular weights. Give two significant figures.

Explanation / Answer

1) moles of acetic anhydride:

      mass of acetic anhydride = density x volume = 1.082 g/mL x 9.6 mL = 10.387 g

Given that molar mass of acetic anhydride= 102 g/mol

Therefore,

moles of acetic anhydride = mass of acetic anhydride/ molar mass of acetic anhydride

                                      = 10.387 g/ 102. g/mol

                                      = 0.1018 moles

Therefore,

0.1018 moles are in 9.6 mL of acetic anhydride.

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