In SO2 and SO3, oxygen combines with sulphur in a fixed ratio.
The law of multiple proportion states that if two elements combine with each other to form more than one chemical compound, then the various masses of the elements which combine with a fixed mass of the other element are in simple multiple ratios.
To illustrate this law, sulphur forms two oxides, SO2 and SO3. The ratio of the oxygen that combines with a fixed mass of sulphur in the two compounds is 2:3 in accordance to the law of multiple proportion.
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