Question

Some potassium permanganate was heated in a test tube. After collecting one litre of oxygen at room temperature, it was found that the test tube had undergone a loss in a mass of 1.32 g. If one litre of hydrogen under the same conditions of temperature and pressure has a mass of 0.0825 g. Calculate the relative molecular mass of oxygen.

2KMnO₄ → K₂MnO₄ +MnO₂ +O₂ (K₂MnO₄ MnO₂ is the solid residue)

Answer 1

Loss in mas is due to the evolution of O₂ gas = 1.32 g

Volume of O₂ produced = 1L