In the reaction with sulfur, 0.5 mol of iron interacts. Determine the mass of iron that should be taken for the reaction.

Given:
n (Fe) = 0.5 mol

To find:
m (Fe) -?

1) Write the equation of a chemical reaction:
S + Fe => FeS;
2) Using the periodic system of D.I.Mendeleev, determine the molar mass of iron:
M (Fe) = Ar (Fe) = 56 g / mol;
3) Calculate the mass of iron:
m (Fe) = n (Fe) * M (Fe) = 0.5 * 56 = 28 g.

Answer: The mass of iron is 28 g.