Question

0.7g of iron combine directly with 0.4 g of sulphur to form FeS. If 2.8 g of Fe are dissolved in dil HCL and excess of Na₂S solution are added.4.4g of solution is precipitated. Prove that these data illustrate the law of constant composition.

Answer 1

The data provided illustrates the law of constant composition, which states that a compound is always composed of the same elements in the same ratio by mass. This law can be observed in the given example of iron combining with sulfur to form FeS, as well as in the subsequent precipitation of FeS.

Step-by-step explanation:

The data provided in the question illustrates the law of constant composition. According to this law, a compound is always composed of the same elements in the same ratio by mass. In the given example, 0.7g of iron combines with 0.4g of sulfur to form FeS. Regardless of the amount of iron or sulfur used, the ratio of iron to sulfur remains constant.

This law can also be observed in the second part of the question, where 2.8g of iron are dissolved in hydrochloric acid (HCl) and excess sodium sulfide (Na₂S) solution is added. The resulting precipitate weighs 4.4g. This indicates that the composition of the precipitate, FeS, remains constant.

Overall, the given data showcases the law of constant composition, which states that the ratio of elements in a compound remains consistent regardless of the quantities used.

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