We may determine the corresponding equilibrium constant by evaporating acetic acid in a container that is...

We may determine the corresponding equilibrium constant by evaporating acetic acid in a container that is subsequently sealed and weighed. In one experiment, acetic acid was evaporated in a container of volume 21.45 cm3 at 437 K. The pressure of the vapor was 101.9 kPa. The mass of acid in the sealed container was 0.0519 g. The experiment was repeated with the same container (same volume and pressure) at a temperature of 471 K; the mass of acid in the second container was 0.0380 g.

Compute the equilibrium constant for dimerization at each of these temperatures.

Determine the standard reaction enthalpy for this process.

Determine ΔG° and ΔS° for the dimerization reaction at 437 K.

Expert Solution

ΔG° = ΔH - TΔS°, ΔG = -RTlnK

ΔG° = -8.314 X 437 X ln (0.740) = 1093.96 J

ΔS° = (ΔH -ΔG)/T = (-103000-1093.96)/437 = -471.396 J entropy decreases on dimerization

queen_honey_blossom answered 2 years ago

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