Aspirin (C9H8O4) is produced by the reaction of salicylic acid (M = 138.1 g/mol) and acetic anhydride (M = 102.1 g/mol).?

[匿名]

2017-10-17 6:51 pm

更新1:

C7H6O3(s) + C4H6O3(l) → C9H8O4(s) + C2H4O2(l) If you react 2.00 g C7H6O3 with 1.60 g C4H6O3, what mass of aspirin (M = 180.2 g/mol) can theoretically be obtained? a. 0.40 g b. 2.61 g c. 2.82 g d. 1.53 g e. 3.60 g

回答 (1)

不用客氣

2017-10-17 11:20 pm

Initial number of moles of C₇H₆O₃ (salicylic acid) = (2.00 g) / (138.1 g/mol) = 0.01448 mol
Initial number of moles of C₄H₆O₃ (acetic anhydride) = (1.60 g) / (102.1 g/mol) = 0.01567 mol

C₇H₆O₃(s) + C₄H₆O₃(l) → C₉H₈O₄(s) + C₂H₄O₂(l)
Mole ratio C₇H₆O₃ : C₄H₆O₃ = 1 : 1
Number of moles of C₄H₆O₃ > Number of moles of C₇H₆O₃
Hence, C₇H₆O₃ completely reacts.

According to the above equation, mole ratio C₇H₆O₃ : C₉H₈O₄ = 1 : 1
Number of moles of C₇H₆O₃ reacted = 0.01448 mol
Number of moles of C₉H₈O₄ theoretical obtained = 0.01448 mol
Mass of C₉H₈O₄ theoretical obtained = (0.01448 mol) × (180.2 g/mol) = 2.61 g

The answer: b. 2.61 g

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