Question 13 • LA-Chemistry A
Al₂(SO₄)₃ contains 2 aluminum atoms, 3 sulfur atoms, and 12 oxygen atoms. Using approximate atomic masses, its molar mass is (2 × 26.98) + (3 × 32.06) + (12 × 16.00) = 342.14 g/mol, which rounds to the listed value of 342.17 g/mol. The correct choice is 342.17 g/mol.
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