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

Strategy:
 Parts per million (ppm) refers to milligrams of solute per kilogram of solvent/mixture. Calculate the absolute mass of Iron required, then use its mass fraction in  to find the total mass of the salt needed.

Step 1: Calculate mass of iron required
Concentration .
Total amount  Iron needed .

Step 2: Relate to the hydrate
Molar mass of .

Nearest integer is 9.

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