Liquid nitrogen can be used to cool down objects. The following data of liquid n

Question

Liquid nitrogen can be used to cool down objects. The following data of liquid nitrogen and nitrogen gas can be used around its boiling point: Furthermore, it is given that the molar heat capacity of N_2 (g) is 29.0 J/K, which Is constant over the considered temperature range for N_2 in gas phase. Calculate the boiling point of nitrogen at atmospheric pressure. What is the molar heat of vaporization for N2 at the boiling point and atmospheric pressure? 2.0 moles of liquid nitrogen evaporate in 10 moles of atmospheric gas (80% N2, 20% 02) and mixes completely at 298 K. What is change in Gibbs energy of mixing due to this mixing?

Explanation / Answer

Ans according to trouton's rule

Delta H / Tb = 10.5 R

Tb = 12000 / ( 10.5 * 8.314)

Tb = 137.46K

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