Nitrogen Henry coefficient

The thermodynamic equilibrium is calculated with the Henry coefficients corrected for the electrolyte influence. As nitric acid is a strong electrolyte, the solubilities of nitrogen oxides in water [81] must be recalculated according to [20] to account for the non-ideal electrolyte behavior. 

An evacuated vessel (V = 1 m ) is filled with 900kg water and 1 kg nitrogen. The temperature is Ti = 300 K. What pressure is built up. What is the necessary heat duty to increase the temperature to T2 = 400 K. What pressure is built up then. The Henry coefficient of nitrogen in water in the temperature range of interest can be evaluated by... 

Nitric acid is a strong electrolyte. Therefore, the solubilities of nitrogen oxides in water given in Ref. 191 and based on Henry s law are utilized and further corrected by using the method of van Krevelen and Hofhjzer (77) for electrolyte solutions. The chemical equilibrium is calculated in terms of liquid-phase activities. The local composition model of Engels (192), based on the UNIQUAC model, is used for the calculation of vapor pressures and activity coefficients of water and nitric acid. Multicomponent diffusion coefficients in the liquid phase are corrected for the nonideality, as suggested in Ref. 57. 

Use the equilibrium correlation above to decide which process is occurring. Hint Since the concentration of either molecular or atomic nitrogen in molten iron is so low, you can assume that both would obey Henry s law with activity coefficients equal to unity.)... 

Oxides of Nitrogen Nitric oxide (NO) and nitrogen dioxide (N02) are also characterized by small solubility in water (Henry s law coefficients 0.002 and 0.01 Matm-1 at 298 K). A negligible fraction of these species is dissolved in cloudwater, and their aqueous-phase concentrations are estimated to be on the order of 1 nM or even smaller. 

Fig. 16.4. Solubility of liquid decane in nitrogen gas at 50°C, calculated from Henry s Law coefficient and decane fugacities based on ideal gas and Lewis Fugacity Rule approximations and the virial equation. Experimental data are solid dots. After Prausnitz (1969)...

---