What mass of iron can react with chlorine weighing 24 g?

Given:

m (Cl2) = 24 g;

To find:

m (Fe) -?

Decision:

Fe + Cl2 = FeCl2, – we solve the problem using the composed reaction equation:

1) Find the amount of chlorine contained in 24 grams of the substance:

n (Cl2) = m: M = 24 g: 35.5 g / mol = 0.676 mol;

2) We compose a logical expression:

if 1 mol of Cl2 requires 1 mol of Fe,

then 0.676 mol of Cl2 will require x mol of Fe,

then x = 0.676 mol.

3) Find the mass of the iron that has reacted:

m (Fe) = n * M = 0.676 mol * 56 g / mol = 37.856 g.

Answer: m (Fe) = 37.856 g.