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Question

An impure sample of silver (1.5 g) is heated with S to form 0.124 g of Ag2S. What was the per cent yield of Ag2S?

A
21.6%
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B
7.2%
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C
1.7%
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D
24.8%
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Solution

The correct option is B 7.2%
Reaction involved:
2Ag+SAg2S
216 g pure Ag react with 32 g S to give 248 g Ag2S.
To obtain 0.124 g Ag2S amount of Ag reacts with S is calculated as:
=216248×0.124=0.108 g
Thus out of 1.5 g sample only 0.108 g (i.e.pure silver) will react to form Ag2S
% yield of Ag2S=0.1081.5×100=7.2%

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