Aspirin can be made in the laboratory by reacting acetic anhydride (c4h6o3) with salicylic acid (c7h6o3) to form aspirin (c9h8o4) and acetic acid (c2h4o2). the balanced equation is: c4h6o3+c7h6o3→c9h8o4+c2h4o2. in a laboratory synthesis, a student begins with 5.00 ml of acetic anhydride (density = 1.08 g / ml) and 2.08 g of salicylic acid. once the reaction is complete, the student collects 2.57 g of aspirin.

Question

Jenna Wells

Chemistry

21 September, 13:39

Aspirin can be made in the laboratory by reacting acetic anhydride (c4h6o3) with salicylic acid (c7h6o3) to form aspirin (c9h8o4) and acetic acid (c2h4o2). the balanced equation is: c4h6o3+c7h6o3→c9h8o4+c2h4o2. in a laboratory synthesis, a student begins with 5.00 ml of acetic anhydride (density = 1.08 g / ml) and 2.08 g of salicylic acid. once the reaction is complete, the student collects 2.57 g of aspirin.

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Solomon Barrett · Answer 1

V (C₄H₆O₃) = 5.00 mL.

d (C₄H₆O₃) = 1.08 g/mL.

m (C₄H₆O₃) = V (C₄H₆O₃) · d (C₄H₆O₃).

m (C₄H₆O₃) = 5.00 mL · 1.08 g/mL.

m (C₄H₆O₃) = 5.4 g.

n (C₄H₆O₃) = m (C₄H₆O₃) : M (C₄H₆O₃).

n (C₄H₆O₃) = 5.4 g : 102 g/mol.

n (C₄H₆O₃) = 0.0529 mol.

n (C₇H₆O₃) = 2.08 g : 138.1 g/mol.

n (C₇H₆O₃) = 0.015 mol; limiting reactant.

From chemical reaction: n (C₄H₆O₃) : n (C₉H₈O₄) = 1 : 1.

n (C₉H₈O₄) = 0.015 mol.

m (C₉H₈O₄) = 0.015 mol · 180.16 g/mol.

m (C₉H₈O₄) = 2.71 g; theoretical yield.

percent yield od aspirine = 2.57 g : 2.71 g · 100% = 94.83%.