For the subsequent reactions, look up the delta Hf values to compute delta H rxn and S values to evaluate delta S system and hence compute delta S universe at 298 K.
a) TiO2 (s) + 4HCl (g) --> TiCl4 (l) + 2H2O (l)
b) CH3CO2H (aq) + CH3OH(aq) --> CH3CO2CH3 (aq) + H2O (l)
c) Hg (s) --> Hg (l)