when iron is heated with sulphur,iron sulphide is formed.The total mass of iron and sulphur is equal to the mass of iron sulphide.why?

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Solution

The reaction proceeds as follows:
Fe + S₂ -------> FeS₂
As we can see that both of them are combining and only one product is formed in the reaction. The mass of FeS₂ formed is equal to mass of Fe & S₂ according to Law of conservation of Mass which states that the total mass of reactants = total mass of products.

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