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354 solutions

Gibbs Free Energy

Q. At 298 K, the equilibrium constant for this reaction: H2(g) + 1/2 O2(g) ⇌ H2O(l) is? Given: ΔG°f (H2O(l)) = -237 kJ•mol^-1 and ΔG°f (H2O(g)) = -229 kJ•mol^-1

Solved • Dec 13, 2019

Gibbs Free Energy

Q. The pH (sometimes called “pD”) of heavy water D2O at 25C is 7.43. Using this value, determine the ΔG° fo the autoionization of heavy water, and compare your value to that of pure water at 25°C. There is a significant difference in the dissociation energies of OH and OD bonds due to the quantum mechanical nature of bond vibrations, with the dissociation energy of an OD bond being approximately 6 kJ/mol greater than that of an OH bond. Is this the correct order of magnitude to explain the difference in the ΔG° values you calculated for the autoionization of H2O and D2O? This is a follow problem to the question I posted earlier. I would really appreciate a step by step explanation!

Solved • Dec 12, 2019

Gibbs Free Energy

Q. Combining free energy equilibrium and water auto-ionization. In our treatment of acid-base equilibria we have used the value of the autoionization constant of water Kw = 1.0 x 10^-14, which is appropriate at 25°C. However, this value varies with temperature and is different for deuterated of “heavy water” D2O. In this problem, you will use thermodynamics to explore these differences. Thermochemical Information at 298 K. Using the above data, determine the pH of pure water at the boiling point 100°C, and compare your value to the pH of pure water at 25C. How does this change relate to Le Chatelier’s Principle? I don't understand what is circled in red. I didn't know there was a direct relationship between Kw and e??

Solved • Dec 11, 2019

Gibbs Free Energy

Q. Calculate the value of the thermodynamic equilibrium constant for the following reactions at 25.0 °C.

Solved • Dec 4, 2019

Gibbs Free Energy

Q. Aluminum oxidizes rather easily, but forms a thin protective coating of Al2O3 that prevents further oxidation of the aluminum beneath. Use the data for ΔH°f and S° to calculate ΔG°f for Al2O3(s) in kJ mol-1.

Solved • Dec 4, 2019

Gibbs Free Energy

Q. For this reaction at 25 C, dH = -1854 kJ and dS = -236 J K^-1. CH3COCH3(g)+4O2(g)-->3CO2(g)+3H2O(l). What is the value of dG for this reaction?

Solved • Dec 4, 2019

Gibbs Free Energy

Q. Which of the relationships is(are) true about water boiling in a container that is open to the atmosphere?

Solved • Dec 4, 2019