Practice question
Question
A compound contains 24% magnesium, 28% sulfur, and 48% oxygen by mass. What is its empirical formula? (Atomic masses: Mg = 24, S = 32, O = 16)
Explanation
For 100 g: Mg = 24 g, S = 28 g, O = 48 g. Moles: Mg = 1, S = 0.875, O = 3. Ratio ≈ 1 : 1 : 3 (adjusted); empirical formula = MgSO₃.
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