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Stoichiometry Percentage Composition by Mass

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An oxide has formula M₂O₃ and contains 68.57% oxygen by mass. The atomic mass of M is approximately:

Verified Answer & Explanation⌄

Correct Answer: A) 11

Concept Explanation

Mass of oxygen in M₂O₃ = 3 × 16 = 48. 48/(2M + 48) = 0.6857 Solving gives M ≈ 11.

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