In the present work enthalpy of formation of the ammonium dinitramide (AND) is received from experimental data on enthalpy of dissolution of this salt. In turn, necessary for this purpose enthalpy of formation anion is determined from 4 groups of the independent data on burning and dissolution of salts nitric and of acids with identical cations. By methods calorimetry of combustion and dissolution are determined enthalpy of formation and dissolution of salts of the hydrazinium, gua-nidinium, aminoguanidiniun and triaminoguanidinium of nitric and DN acids. Using enthalpy of formation of the nitrate-ion, enthalpies of formation indicated cations in the indefinitely diluted water solution are calculated. The received data have allowed to determine values enthalpy of formation of anion DN of the acid on enthalpies of formation and dissolution of salts of this acid with indicated cations. As a result of the executed researches the average weighted size enthalpy of formation of anion DN of the acid is received. Enthalpy of dissolution ADN is measured equal 8,71 ± 0,01 kcal · mol~(-1). By the method of the combustion calorimetry the energy of combustion ADN for a sample with cleanliness above than 99.9 % is measured and is calculated its enthalpy of formation, which has made 32,20 ± 0,19 kcal · mol~(-1). We recommend average weighted value enthalpy of formation ADN, equal 32, 16 ±0, 11 kcal · mol~(-1).
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