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Question

# Aspirin (C9H8O4) is prepared by reacting salicylic acid (C7H6O3) and acetic anhydride (C4H6O3).C7H6O3+C4H6O3→C9H8O4+C2H4O2How many moles of salicylic acid should be used to prepare six 5-grain aspirin tablets? (1 g = 15.5 grains)

A
0.01
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B
0.1
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C
1.0
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D
2.0
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Solution

## The correct option is C 0.01For aspirin, 1 gram = 15.5 grains. 5 grains =5×115.5=0.32 gram The molar mass of aspirin, MMaspirin=180 g/mol.180 g = 1 mol .For one 5 grains tablet of aspirin 0.32 g =0.32180=0.0018 mol0.0018 moles of aspirin are obtained from 0.0018 moles of salicylic acid.Hence, for 6 tablets the moles of salycilic acid = 6×0.0018=0.01 moles.Therefore, the option is A.

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