4. (45 ptsThermodynamics. Using the appropriate thermodynamic data (below), calc

Question

4. (45 ptsThermodynamics. Using the appropriate thermodynamic data (below), calculate the required quantities. (4a) Forthereaction: 2NO2(g)- H2O2(I) 2HNO3(aq),AS Calculate the absolute entropy tat 25 °C) of H2020) is-296 88 J mor'K (4b) For the reaction: 3NO2(g) + H2O(l) 2HNO3(aq) + NO(g), Gois-52.46 kJ. Calculate Gibb's free energy of formation of NO(g). (4c) What is the boiling point of nitric acid? to chan H20(1) -285.83 HNO3(l) 174.10 HNO3(g) -135.06 HNO3(aq) -207.36 NO2(9) 33.1 69 95 155.60 266.38 1 237.15 -80.71 74.72 46.40111.25 04 51.23

Explanation / Answer

4a. dSorxn = dSo(products) - dSo(reactants)

-296.88 = (2 x 146.4) - (2 x 239.95 + dSo[H2O2(l)])

So standard entropy of H2O2(l) at 25 oC would be,

dSo[H2O2(l)] = 109.78 J/mol-K

4b. for the reaction,

dGo = dGo(products) - dGo(reactants)

-52.46 = (2 x -111.25 + dGo(NO(g))) - (3 x 51.23 - 237.15)

dGo(NO(g)) = 86.79 kJ/mol

4c. Boiling point of nitric acid from Ist equation

dHo = (2 x -207.36) - (2 x 33.1 - 187.78) = 536.3 kJ/mol

normal boiling point = dH/dS = -1806.454

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