Calculate the mass of iron needed to get 100ml. Hydrogen when it interacts with sulfuric acid.

1. Let’s compose the equation of replacement of hydrogen by iron in sulfuric acid:

Fe + H2SO4 = FeSO4 + H2 ↑;

2. Having previously converted the value of the volume of released gas into liters, we calculate its chemical amount:

n (H2) = V (H2): Vm = 0.1: 22.4 = 0.0045 mol;

3. The amounts of reacted iron and produced hydrogen are the same:

n (Fe) = n (H2) = 0.0045 mol;

4. Let’s calculate the mass of iron:

m (Fe) = n (Fe) * M (Fe) = 0.0045 * 56 = 0.252 g.

Answer: 0.252 g.