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Chemistry
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If 1.5g of salicylic acid are reacted with excess ethanoic anhydride, calculate the theoretical yield of acetylsalicyclic acid in grams.

Jul 29th, 2015

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  Balanced chemical reaction: C7H6O3 + C4H6O3   =  C9H8O4 + C2H4O2

Now convert 1.5 grams of salicylic acid to moles of salicylic acid, to moles of acetylsalicylic acid, to grams of acetylsalicylic acid.

1 mol C7H6O3 = 138.122 g C7H6O3 ; 1 mol C7H6O3 = 1 mol C9H8O4  ; 1 mol C9H8O4 = 180.159 g C9H8O4

using above information we can write that

[1.5 /1] [1/(138.122 ] [180.159 /1 ] = 1.95652  g C9H8O4

Hence theoretical yield of acetylsalicylic acid is about 2.0 grams.

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Jul 29th, 2015

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