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H2O2 is oxidised by MnO4⁻ in acidic medium, producing O2 and Mn²+. How many grams of O2 are produced when 1.5*10⁻³ moles of MnO4⁻ react with 1.7 milligrams of H2O2?
- 1.6 * 10⁻³
- 2.5 * 10⁻³
- 7.5 * 10⁻⁴
- 0.35 * 10⁻⁵
Correct answer: 1.6 * 10⁻³
Solution
H2O2 is the limiting reagent (5*10⁻⁵ mol), and since the mole ratio H2O2:O2 is 1:1 in the balanced equation, O2 produced = 5*10⁻⁵ mol, giving 5*10⁻⁵ * 32 = 1.6*10⁻³ g.
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