with a solution of potassium permanganate according

in a volumetric analysis experiment, a solution of sodium oxalate ( Na2C2O4) in acidic solution is titrated with a solution of potassium permanganate according to the following balance chemical equation. 2KMnO4(aq) + 8H2SO4(aq) + 5 Na2C2O4(aq) _> 2MnSO4(aq) + 8H2O(aq) + 10CO2(g) +5 Na2SO4(aq) + K2SO4(aq)it required 20 ml of 0.0147 MKnO4 to reach the end point. what mass of Na2C2O4 was present initially?

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