Question

31 select the correct answer. what is the molar mass of alcl3? a. 62.43 g/mol b. 116.39 g/mol c. 124.86 g/mol d. 133.33 g/mol e. 187.29 g/mol

Explanation:

Step1: Identify atomic masses

From the periodic - table, the atomic mass of Al (aluminum) is approximately 26.98 g/mol and the atomic mass of Cl (chlorine) is approximately 35.45 g/mol.

Step2: Calculate molar mass of AlCl₃

The formula for AlCl₃ has 1 Al atom and 3 Cl atoms. The molar mass \(M\) of AlCl₃ is \(M = 1\times26.98+3\times35.45\).
First, calculate \(3\times35.45 = 106.35\).
Then, \(26.98 + 106.35=133.33\) g/mol.

Answer:

D. 133.33 g/mol