In an experiment of analysis of oxalate salt, a solution of oxalate gives white precipitate with CaCl₂ solution. This precipitate is dissolved in dilute H₂SO₄ and decolourises KMnO₄ (acidified) solution as the following reactions.
Na₂C₂O₄ + CaCl₂ → CaC₂O₄$\downarrow$ + 2NaCl
                                     white

CaC₂O₄ + H₂SO₄ → CaSO₄ + H₂C₂O₄

2KMnO₄ + 3H₂SO₄ + 5H₂C₂O₄ → 2MnSO₄ + K₂SO₄ + 8H₂O + 10CO₂

If one mol of Na₂C₂O₄ is taken and reacted with sufficient amount of other reactants such as to give 100% reaction yield at each step and the liberated CO₂ is kept in a container of  volume 'V' at pressure 'P' , temperature 'T'. Then U_rms of CO₂ gas in container will be