Fortification of food with iron is done using . The mass in grams of required to achieve 12 ppm of iron in 150 kg of wheat is (Nearest integer)

[Given: Molar mass of Fe, S and O respectively are 56

Question

Fortification of food with iron is done using . The mass in grams of  required to achieve 12 ppm of iron in 150 kg of wheat is  (Nearest integer)

[Given: Molar mass of Fe, S and O respectively are 56, 32 and 16 g mol]

Canvas Classes · Accepted Answer

🧠 PPM means mg per kg
 ppm of iron in  wheat means  Fe in every , total . But you don't add pure Fe — you add the hydrate , which is much heavier per Fe atom.

🗺️ Step by step
Iron needed .

Molar mass of :

Each  of hydrate contains  of Fe. So mass of hydrate needed:

Nearest integer is .

⚠️ Common mistake
Don't add  of  directly. Only  of the hydrate is iron — so you need about  more.

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