Percentage of purity

Chemistry Level 3

A sample of impure C u X 2 O \ce{Cu_2 O} contains 66.6% copper. What is the percentage (to the nearest %) of pure C u X 2 O \ce{Cu_2 O} in the sample?


The answer is 75.

Abhiram Rao by Abhiram Rao , 18, India

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1 solution

Ashish Menon
May 2, 2016

100 % 100\% pure C u 2 O {Cu}_2O contains ( 2 × 64 ) ( 2 × 64 ) + 16 × 100 128 144 × 100 88.8 % \dfrac{(2 × 64)}{(2 × 64) + 16} × 100\\ \dfrac{128}{144} × 100\\ 88.8\%

So, 66 % 66\% pure C u Cu is present in 100 × 66.6 88.8 = 75 % \dfrac{100 × 66.6}{88.8}\\ = \boxed{75\%}

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