Copper  sulphide `(Cus)` contains `66.5 % Cu` copper axide `(CuO)` contains  `79.9% Cu`
Channel: Doubtnut
Date: 2020-08-30

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)`.