How much iron can dissolve in 19.6 g of sulfuric acid?

Let’s compose the equation for the reaction of the interaction of iron with sulfuric acid:
Fe + H2SO4 = FeSO4 + H2;

Let’s find the molecular weight of sulfuric acid:
1 * 2 + 32 + 16 * 4 = 98 g / mol;

Let’s find the amount of substance in sulfuric acid:
19.6 / 98 = 0.2 mol;

The molecular weight of iron is 56 g / mol. Iron has the same coefficient as sulfuric acid. This means that the amount of substance in iron is 0.2 mol. Let’s find the mass of iron:
56 * 0.2 = 11.2 grams;

Answer: the mass of iron is 11.2 grams.