Mole ConceptHard
Question
A sample of impure cuprous oxide contains 66.67% copper by mass. What is the percentage of pure Cu2O in the sample? (Cu = 63.5)
Options
A.66.67
B.75
C.70
D.80
Solution
Mass per cent of Cu2O = $\frac{143}{127} \times 66.67 = 75.06\%$
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