Revsision Questions for How Much Topic

Revsision Questions for How Much Topic

  • Submitted By: hrstevens
  • Date Submitted: 10/01/2013 4:54 AM
  • Category: Science
  • Words: 1984
  • Page: 8
  • Views: 91

How Much Revision Questions



Q1. Aspirin tablets have important medical uses.




(a) Aspirin is made when salicylic acid reacts with ethanoic anhydride.
The equation for this reaction is:
C7H6O3 + C4H6O3 → C9H8O4 + CH3COOH
salicylic acid aspirin
Calculate the maximum mass of aspirin that could be made from 100 g of salicylic acid.
Show clearly how you work out your answer.
The relative formula mass (Mr) of salicylic acid (C7H6O3) is 138.
The relative formula mass (Mr) of aspirin (C9H8O4) is 180.
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Maximum mass of aspirin = .................................... g
(2)

(b) (i) In an experiment a chemist calculated that the maximum yield of aspirin is 400 g.
The chemist did the experiment but only made 250 g of aspirin.
Calculate the percentage yield of aspirin for this experiment.
Show clearly how you work out your answer.
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Percentage yield of aspirin =...

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