Nitrogen standard entropies

Consider the following example. Using information from the SQA Data Booklet and the fact that silver(l) nitrate and nitrogen dioxide have S° values of 142 and 241J K mol respectively, calculate the standard entropy change, AS°, for the decomposition of silver(l) nitrate ... 

The heat capacity of thiazole was determined by adiabatic calorimetry from 5 to 340°K by Goursot and Westrum (295,296). A glass-type transition occurs between 145 and 175 K. Melting occurs at 239.53°K (-33.62°C) with an enthalpy increment of 2292 cal mole" and an entropy increment of 9.57 cal mole" -"K". Table 1-44 summarizes the variations as a function of temperature of the most important thermodynamic properties of thiazole molar heat capacity Cp, standard entropy S°, and Gibbs function -(G°-The variation of Cp for crystalline thiazole between 145 and 175°K reveals a marked inflection that has been attributed to a gain in molecular freedom within the crystal lattice. The heat capacity of the liquid phase varies nearly linearly with temperature to 310°K, at which temperature it rises more rapidly. This thermal behavior, which is not uncommon for nitrogen compounds, has been attributed to weak intermolecular association. The remarkable agreement of the third-law ideal-gas entropy at... 

Problem Calculate the total standard entropy of nitrogen gas at 25 C, using data in Tables VIII and IX. 

Relative Standard Entropies Molecular Complexity For a given state of matter, entropy generally increases with increasing molecular complexity. For example, consider the standard entropies of the argon and nitrogen monoxide gas ... 

Since the ground state of molecular nitrogen is a singlet level, is unity, and the molecular weight M being 28.00, the combined standard translational and electronic entropy, the latter being actually zero, is given by equation (24.16) as... 

The National Bureau of Standards Report 6928 lists the properties of compounds of lithium, beryllium, magnesium, and aluminium with hydrogen, oxygen, fluorine, chlorine, nitrogen, and carbon. Thermodynamic functions for the ideal gases, solids, and liquids are tabulated (e.g. values of free energy functions and enthalpy functions , entropy, and heat capacity). 

Use data from Appendix D to calculate the standard reaction entropy at 298.15 K for the conversion of nitrogen monoxide to nitrogen dioxide (a step in the manufacture of nitric acid). 

PRACTICE EXAMPLE B N2O3 is an unstable oxide that readily decomposes. The standard reaction entropy for the decomposition of N2O3 to nitrogen monoxide and nitrogen dioxide at 25 °C is AjS = 138.5 J mol What is the standard molar entropy of N203(g) at 25 °C ... 

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