Determine the molar mass of calcium chloride.

To solve this problem, we need to find the necessary chemical elements in the periodic table.

chlorine (Cl);
calcium (Ca);
calcium chloride (CaCl2).
Chlorine – a chemical element with atomic number 17, is in the third period of the table. Atomic mass 35.5.

Calcium, a chemical element with atomic number 20, is in the fourth period of the table. Atomic mass 40.

Find the molecular weight of calcium chloride
Molecular weight is the sum of the relative atomic masses of the elements that make up a given compound.

Mr is molecular weight;
Ar is the relative atomic mass (atomic mass, amu);
Molecular weight is immeasurable.
Mr (CaCl2) = Ar (Ca) + Ar (2Cl).

Substitute the numerical values: Mr (CaCl2) = 40 + 35.5 x 2 = 111.

Find the molar mass of calcium chloride
The molar mass (M) is equal to the molecular mass (Mr), but has a dimension of g / mol.

Hence Mr (CaCl2) = M (CaCl2), i.e. M (CaCl2) = 111 g / mol.

Answer: The molar mass of calcium chloride is 111 g / mol.