What is the mass of ClCa, if the amount of substance = 1.5 mol?

Given:
n (CaCl2) = 1.5 mol

To find:
m (CaCl2) -?

Decision:
1) Using the periodic system of D.I.Mendeleev, calculate the molar mass of calcium chloride:
M (CaCl2) = Mr (CaCl2) = Ar (Ca) * N (Ca) + Ar (Cl) * N (Cl) = 40 * 1 + 35.5 * 2 = 111 g / mol;
2) Calculate the mass of calcium chloride:
m (CaCl2) = n (CaCl2) * M (CaCl2) = 1.5 * 111 = 166.5 g.

Answer: The mass of CaCl2 is 166.5 g.