a) The vapour pressure of mercury at 100 ºC is 36.38 Pa. Calculate ∆Gº of vaporization of Hg (ℓ) at 100 º C.

Question

b) The vapour pressure of acetone, CH3COCH3 (ℓ) at 25 º C is 232 Torr. If ∆Gf º of CH3COCH3 (ℓ) at 25ºC is −155.7 kJ/mol , calculate ∆Gf º of CH3COCH3 (g) at 25 ºC.

c) For the reaction 2 CuBr2 (s) → 2 CuBr (s) + Br2 (g) , the equilibrium vapour pressure of Br2 (g) is 1.90 x 10− 6 kPa at 298 K. Calculate ∆G for this reaction at 298 K if Br2 (g) is produced at a pressure of 1.00 x 10− 7 kPa.

d) The equilibrium constant for the reaction HNO2 (aq) + H2 O ( ℓ) ↔ NO2¯ (g) + H3O+ (aq)
is 4.3 x 10 − 4 at 25º C. Will nitrous acid spontaneously dissociate when:
at [HNO2] = [NO2¯] = [H3O + ] = 1.0 M ?
at [HNO2] = 1.0 M and [NO2¯ ] = [H3O + ] = 1.0 x 10− 5 M ?

thanks in advance!