(a) Account for formation of the following series of oxides in terms of the electron configurations of the elements and the discussion of ionic compounds in Section: K2O, CaO, Sc2O3, TiO2, V2O5, CrO3. (b) Name these oxides. (c) Consider the metal oxides whose enthalpies of formation (in kJ mol–1) are listed here.
Oxide | K2O(s) | CaO(s) | TiO2(s) | V2O5(s) |
ΔHf° | -363.2 | -635.1 | -938.7 | -1550.6 |
Calculate the enthalpy changes in the following general reaction for each case:
MnOm(s) + H2(g)→nM(s) + mH2O(g)
(You will need to write the balanced equation for each case and then compute ΔH°.) (d) Based on the data given, estimate a value of ΔHf° for Sc2O3(s)
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