i got -120 for the enthalpy
-3 (-2.9 rounded) for the freezing point
something about 4 and 7 for the two pH questions
the value for n in FeO(OH) nH2O i got it as 1
and y= 3 but not sure about the working out, i used oxidation states as (Oxygen's which is always -2)y+ 3(Fe's)=0. Fe is +2 or +3, with +3 it gave a fraction and with +2 ig gives Y=3