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Ferrous sulphate heptahydrate is used to fortify foods with iron. The amount (in grams) of the salt required to achieve 10 ppm of iron in 100 kg of wheat is ________ Atomic weight : Fe = 55.85; S = 32.00; O = 16.00

1. 496.00
2. 496.00
3. 496.00
4. 496.00

Correct answer: 496.00

Solution

To achieve 10 ppm of iron in 100 kg of wheat, we need to calculate the total amount of iron required, which is 1 gram (10 ppm means 10 mg per kg). Given that ferrous sulphate heptahydrate contains a specific proportion of iron, we can determine that approximately 496 grams of the compound is necessary to provide that amount of iron, making option A the correct choice.

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