One needs some experimental data to determine

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Problem

One needs some experimental data to determine ΛH2C2O4∘\Lambda^\circ_{\text{H}_2\text{C}_2\text{O}_4} . Which value is also needed in addition of ΛHNO3∘\Lambda^\circ_{\text{HNO}_3} and ΛK2C2O4∘\Lambda^\circ_{\text{K}_2\text{C}_2\text{O}_4} ? (1) ΛNaCl∘\Lambda^\circ_{\text{NaCl}} (2) ΛKNO3∘\Lambda^\circ_{\text{KNO}_3} (3) ΛKCl∘\Lambda^\circ_{\text{KCl}} (4) ΛNa2C2O4∘\Lambda^\circ_{\text{Na}_2\text{C}_2\text{O}_4}

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