What does the law of constant composition state? Give an example.?

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noclue

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Law of Composition: A given compound always contains the same elements in the same proportions by mass.

1. What does the above statement mean?

2. For example, does CuSO4*5H2O follow the law of constant composition? Why or why not?

3. Give an example with another chemical. :]

Thanks~
 
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