Question
question number 4
Given the following in the gas phase: CH_3OH, CO, CO_2, H_2 O, H_2. Find the transfer of components and degrees of freedom. Write down the reactions that are constrains on the number of components. Given the delta G degree (298 K) for the following species: CH_3OH: -166.3, CO, -137.2, CO_2, -194.4, H_2O, -228.6, all in KJ. Find K for each reaction that is used as a constraint. Suppose the temperature drops and H_2O freezes, and CH_2OH condenses to a liquid. What are the new values for components, degreed of freedom, and phases? Starting from one mole of N_2 and one mole of O-2, find the equilibrium ratio of N_2/NO_3 t 298k. (Neglect any other possible nitrogen - oxygen reaction) (Given N_2 + 2O_2 rightarrow 2NO_2) Find the same ratio at 350 K; assume delta C_p is small enough to neglect it. Given: Delta_T G degree (NO_2, 298 K) = + 51.3 KJ; delta-1 H degree (CF_2, 298 K) = + 33.2 kJ The vapour pressure of a gas X_2 is 16 kPa (0.16 bar) at 298 K, and 100 kPa at 350 K. Find What additional information would you need to find delta C_p ? What can you say about.
Explanation / Answer
vapor pressure P1 = 16 kPa
vapor pressure P2 = 100 kPa
temperature T1 = 298 K
temperature T2 = 350 K
ln (P2 / P1) = delta Hvap / R [1/T1 - 1/T2]
ln (100 / 16) = delta Hvap / 8.314 x 10^-3 [1/298 - 1/350]
delta Hvap = 30.6 kJ/mol
