The enthalpies of formation of 1,2,4-triazol-5-one and 3-nitro-1,2,4-triazol-5-one

Article abstract of DOI:10.1016/S0021-9614(05)80150-8

The standard (p^<*> = 0.1 MPa) molar enthalpies of formation of 1,2,4-triazol-5-one and 3-nitro-1,2,4-triazol-5-one have been determined from measurements of their energies of combustion in oxygen as -(142.4 +/- 0.7) kJ*mol^-1 and -(129.4 +/- 1.1) kJ*mol^-1, respectively.From measurements of the enthalpies of neutralization of 3-nitro-1,2,4-triazol-5-one with NaOH(aq) and KOH(aq) the enthalpies of formation of the crystalline sodium and potassium salts have been determined as -(362.6 +/- 1.2) kJ*mol^-1 and -(385.1+/-1.1) kJ*mol^-1, respectively.