3268 kJ are required to change 1 mole of ethanol into its

3268 kJ are required to change 1 mole of ethanol into its gaseous atoms.

C2H5OH(g) → 2C(g) + 6H(g) + O(g)

a. Calculate the entropy change of the surroundings during this process when it is carried out at 150°C.

b. Explain why the total entropy change of this reaction is likely to be negative.

c. When ethanol undergoes combustion, carbon dioxide and water are formed.

C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l)            ΔHθreaction = –1367 kJ mol–1

Calculate the total standard entropy change for this reaction. (Values for Sθin J K–1 mol–1: C2H5OH(l) = 160.7, CO2 =213.6, H2O(l) = 69.90, O2(g) = 205.0)

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