Carbon dioxide contains 27% carbon, carbon disulphide contains 15 .79% of carbon sulphur dioxide contains 50% of sulphur. This data is an agreement with

In CS2; C : S mass ratio is 15.79:84.21,∴27.27 parts of carbon will combine withS=84.21×27.2715.79=145.434Hence, ratio of S:0 is 145.434 : 72.73, i.e.2 :1In SO2, the ratio of S :0 is 1 : 1Since, the ratio of S :0 is a simple whole number ratio,therefore law of reciprocal proportions is proved.