
Keywords: میکروکالوریمتری Calvet; 5-fluoro-2-methylbenzoxazole; 5-fluoro-2-methylbenzothiazole; Enthalpy of formation; Enthalpy of vaporization; Comparison experiments; Combustion calorimetry; Calvet microcalorimetry; Heat capacity; G3(MP2)//B3LYP method;