Question

what is the percent al in al₂o₃? (al = 26.98 g/mol, o = 16.00 g/mol) % al

Explanation:

Step1: Calculate mass of Al in Al₂O₃

Mass of Al = 2 × 26.98 g/mol = 53.96 g/mol

Step2: Calculate molar mass of Al₂O₃

Molar mass = 53.96 g/mol + (3 × 16.00 g/mol) = 53.96 + 48.00 = 101.96 g/mol

Step3: Compute percent Al

Percent Al = $\frac{53.96}{101.96} × 100 ≈ 52.92$

Answer:

52.92%