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Copper sulphide (Cus) contains 66.5 % C...

Copper sulphide `(Cus)` contains `66.5 % Cu` copper axide `(CuO)` contains `79.9% Cu` and sulphur trioxide `(SO_(3))` containts `40% S`. Shows that these compounds obey the law of recipreocal proportions.
Strategy: Elements `S` and `O` chemically combine seperately with element `Cu` to from `Cus` adn `CuO`. Elements `S` and `O` also chemicaly combine with each other to form `SO_(3)`. Find the ratio of masses of `S` to `O` combining with a given mass of `Cu` and also find the ratio of masses of `S` to `O` in`SO_(3)`.

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