Question:
Ferrous sulphate heptahydrate is used to fortify foods with iron. The amount (in grams) of the salt required to achieve $10 \mathrm{ppm}$ of iron in 100 $\mathrm{kg}$ of wheat is________.
Atomic weight $: \mathrm{Fe}=55.85 ; \mathrm{S}=32.0$;
$\mathrm{O}=16.00$
Solution:
