A 7.95 g sample of calcium sulfide was decomposed into its constituent elements,

Question

A 7.95 g sample of calcium sulfide was decomposed into its constituent elements, producing 4.42 g of calcium and 3.53 g of sulfur. Which of the following statements are consistent with the law of constant composition (definite proportions)? Select all that apply. The ratio of calcium to sulfur will vary based on how the sample was prepared. The mass ratio of Ca to S in every sample of calcium sulfide is 1.25. Every sample of calcium sulfide will have 55.6% mass of calcium. The mass percentage of calcium plus the mass percentage of sulfur in every sample of calcium sulfide equals 100%. Every sample of calcium sulfide will have 4.42 g of calcium.

Explanation / Answer

True statements regarding decomposition of CaS into constituent Ca and S species,

The mass ratio of Ca to S in CaS in every sample is 1.25

The mass percentage of Ca and S in every sample would be 100%

Every sample of CaS will have 55.6% mass of calcium

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