Question

1. determine the percent composition of each element in alcl₃.

Explanation:

Step1: Find molar masses of elements

Molar mass of Al = 26.98 g/mol; molar mass of Cl = 35.45 g/mol

Step2: Calculate molar mass of AlCl₃

Molar mass = 26.98 + 3×35.45 = 26.98 + 106.35 = 133.33 g/mol

Step3: Compute % of Al

% Al = $\frac{26.98}{133.33}$×100 ≈ 20.24%

Step4: Compute % of Cl

% Cl = $\frac{106.35}{133.33}$×100 ≈ 79.76%

Answer:

Percent composition of Al: ~20.24%, Percent composition of Cl: ~79.76%