# About 1 kgl and a heat capacity of about 4 2 j k 1 g

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about 1 kg/L and a heat capacity of about 4 . 2 J K - 1 g - 1 . Now suppose that we could put a little insulated jacket around a hepatocyte. Considering only this one reaction, how long would it take for the temperature to rise by 5 C? [6 marks] 3. (a) The equilibrium constant for dissolving hydrogen sulfide in water H 2 S (g) * ) H 2 S (aq) is 0.087 at 298.15 K. What is the standard free energy of formation of an aqueous hydrogen sulfide molecule? [4 marks] (b) The slope of a graph of ln K vs T - 1 for the above solubility process is 2100 K. What is the standard enthalpy of formation of aqueous hydrogen sulfide? [4 marks] (c) The standard entropy of gaseous H 2 S at 298.15 K is 205 . 77 J K - 1 mol - 1 . What is the standard entropy of aqueous H 2 S? [4 marks] 1

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4. Gallium nitride (GaN) is a solid semiconductor used in light-emitting diodes. Jacob and Rajitha have recently reviewed the available data on the thermodynamic properties of GaN. 1 They found that the standard free energy of formation of GaN over the temperature range was well fit by the equation Δ f G = - 131 530 + 117 . 4 T, (1) over the temperature range 800 to 1400 K, where Δ f G is in J/mol and T is in K.
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