Question

C7H6O3+C4H6O3⟶C9H8O4+C2H4O2C7H6O3+C4H6O3⟶C9H8O4+C2H4O2   A student started with 3.81 mL3.81 mL acetic anhydride (d...


Aspirin can be synthesized in the lab by combining salicylic acid (C7H6O3)C7H6O3) and acetic anhydride (C4H6O3)C4H6O3) to form aspirin (C9H8O4)C9H8O4) and acetic acid (C2H4O2).C2H4O2). The balanced equation for this reaction is

 

C7H6O3+C4H6O3⟶C9H8O4+C2H4O2C7H6O3+C4H6O3⟶C9H8O4+C2H4O2

 

A student started with 3.81 mL3.81 mL acetic anhydride (density=1.08 g/mL)(density=1.08 g/mL) and 2.40 g2.40 g salicylic acid. The student synthesized 2.54 g2.54 g of aspirin. What is the limiting reactant of the equation and the theoretical and percent yield of aspirin?

Answer

Acetic anhydride + salicylic acid --> aspirin + acetic acid

Density of acetic anhydride = 1.08 g/mL in 3.81 mL acetic anhydride.

Density= mass/ volume

Mass of acetic anhydride= 1.08 × 3.81 = 4.11 g

Also mass of salicylic acid is given 2.40 g

And the produced aspirin of total mass 2.54 g 

 

To find the limiting Reagant we need to compare the number of moles of reactants.

Number of moles = mass of compound/molar mass of compound

Number of moles of acetic acid is 0.040 moles

Number of moles of salicylic acid is 0.017 moles

Number of moles of aspirin produced are 0.015 moles that are due to limited salicylic acid.

 

So the limiting Reagant here is salicylic acid.

 

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