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Question

The chemical equivalent of copper relative atomic mass 63.5 is 63.5 g.

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Solution

Naturally occurring copper consists of 69.2% copper-63(63Cu) and 30.8% copper-65(65Cu)
Still think in terms of 100 atoms and don't be put off by decimal fractions, it still works out correctly because 69.2+30.8=100
average mass = relative atomic mass of copper = (63×69.2)+(65×30.8)100=63.5g

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