Which among MnO₂, Mn₂O₃, MnO₃ and Mn₂O₇ contains the maximum percentage by weight of combined oxygen?
Correct answer: D. Mn₂O₇
- A. MnO₂
- B. MnO₃
- C. Mn₂O₃
- D. Mn₂O₇
Explanation
To find the maximum percentage, observe the mass ratio of oxygen to manganese (Mn ≈ 55, O ≈ 16). In Mn₂O₇, the mass ratio of O:Mn is (7×16):(2×55) or 112:110. Since the mass of oxygen is greater than the mass of manganese, it has the highest oxygen percentage.
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About Fundamental Concepts of Chemistry
Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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