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The proper molar sample of DNP was dissolved in NMP at 298.15K in order to form solution.The enthalpy of the process of dissolution was detected by the RD496-2000 Calvet microcalorimeter.Each process was repeated five times to ensure the precision of the data.The thermochemical data obtained are listed in Table 1.In Table 1,b is the molality of DNP,ΔdissH is the molar enthalpy of dissolution,ΔdissHpartial is the relative partial molar enthalpy of dissolution,and ΔdissHapparent is the relative apparent molar enthalpy of dissolution.