Answer :
Final answer:
The question is about the chemical reaction between iron and chlorine to form iron (II) chloride. By applying the Law of Conservation of Mass, we find that the missing mass of iron in the reaction is 58g, making option 'A' the correct answer.
Explanation:
This question is about the chemical reaction of iron and chlorine to form iron (II) chloride. Let's first recall the fact that in a balanced chemical reaction, the mass of the reactants equals the mass of the products (Law of Conservation of Mass). You're given that you have 71 g of chlorine and the total mass of the product is 129 g. This means the missing mass must be the mass of iron.
So the mass of iron is calculated by taking the total mass of the product and subtracting the mass of chlorine: 129 g (iron (II) chloride) - 71 g (chlorine) = 58 g of iron. Therefore option A, 58 g, is the correct answer.
So in summary, 58 g of iron reacts with 71 g of chlorine to form 129 g of iron (II) chloride.
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