It is given that,
a 8.638.63g sample was decomposed into its constituents.
It is producing 4.804g calcium and 3.833g of sulfur.
The mass ratio of Ca: s = 4.804/3.833
=1.253
⇒ mass of calcium = 40.078
mass of sulfur = 32.068
Total mass of CaS = 72.146 grams
mass percentage of Ca = 40.078/72.146 x 100
=55.56%
mass percentage of S = 32.068/72.146 x 100
=44.44%
Thus, in every sample the mass percentage of calcium plus sulfur in every sample is equal to 100%
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