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A sample of impure cuprite Cu2O contains 66.6% copper. What is the percentage of pure Cu2O in the sample?

Asked by sakshisingh3124 7th July 2018, 11:17 PM
Answered by Expert
Answer:
C o n s i d e r space t h e space v o l u m e space V space equals 100 g space h e n c e space C u space equals space 66.6 g
T h e space n o. space o f space m o l e s space equals space fraction numerator 66.6 over denominator 63.6 end fraction equals 1.05 space m o l e s

1 space m o l e space o f space o x y g e n space i s space p e r space 2 space m o l e s space o f space C u comma
t h e r e f o r e space m o l e s space o f space o x y g e n space equals space fraction numerator 1.05 over denominator 2 end fraction equals space 0.53 m o l e s

T h e space w e i g h t space o f space o x y g e n space i s space t h e n space 0.53 m o l space cross times 16 space g divided by m o l space equals space 8.42 g

T h e space w t. space o f space C u subscript 2 O space equals space W t. space o f space C u space plus space w t. space o f space O
space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 66.6 g space plus space space 8.42 g
space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 75.02 space g space i n space 100 g space o f space s a m p l e

T h e r e f o r e space P e r c e n t a g e space o f space space C u subscript 2 O space i n space 100 g space o f space s a m p l e space equals space fraction numerator 75.02 over denominator 100 end fraction cross times 100 space equals space 75 space percent sign
Answered by Expert 9th July 2018, 11:38 AM
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