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0.7 g of iron reacts directly with 0.4 g...

`0.7 g` of iron reacts directly with `0.4 g` of sulphur to form ferrous sulphide. If `2.8 g` of iron is dissolved in dilute `HCl` and excess of sodium sulphide solution is added, `4.4 g` of iron sulphide is precipitated. Prove the law of constant composition.

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To prove the law of constant composition using the given data, we will analyze the reactions and the ratios of the elements involved. ### Step-by-Step Solution: 1. **Identify the Reaction**: The reaction between iron (Fe) and sulfur (S) to form ferrous sulfide (FeS) can be represented as: \[ \text{Fe} + \text{S} \rightarrow \text{FeS} ...
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