The equation for the formation of a gaseous sulfate ion is shown.S(s) + 2O2 (g) + 2e– → SO42– (g) ∆H = of SO42– (g)Calculate the standard enthalpy change of formation, , of SO42– (g). It may be helpfulto draw a labelled energy cycle. Use relevant data from Table 1.1 in your calculations.Table 1.1energy change value / kJ mol–1lattice energy of barium sulfate, BaSO 4 (s) –2469standard enthalpy change of formation of barium sulfate –1473standard enthalpy change of atomisation of barium +180first ionisation energy of barium +503second ionisation energy of barium +965standard enthalpy change of atomisation of sulfur +279standard enthalpy change for S(g) → S 2– (g) +440standard enthalpy change for O(g) → O 2– (g) +657O=O bond energy +496of SO42– (g) = .............................. kJ mol–1 [3]

lattice energy of barium sulfate, BaSO 4 (s) –2469standard enthalpy change of formation of barium sulfate –1473standard enthalpy change of atomisation of barium +180first ionisation energy of barium +503second ionisation energy of barium +965standard enthalpy change of atomisation of sulfur +279standard enthalpy change for S(g) → S 2– (g) +440standard enthalpy change for O(g) → O 2– (g) +657O=O bond energy +496of SO42– (g) = .............................. kJ mol–1 [3]

The value of Ksp for barium sulfate is 1.1 x 10-10.A solution of barium sulfate with a concentration of 4.0 x 10-4 mol L-1 is Question 8Select one:a.undersaturated and precipitation of solid barium sulfate will not occur.b.supersaturated and precipitation of solid barium sulfate will not occur.c.of unknown saturation so prediction is not possible.d.supersaturated and precipitation of solid barium sulfate will occur.e.undersaturated and precipitation of solid barium sulfate will occur.

The  ΔfH∘  of  BaSO4(s), Ba2+(aq)  and  SO42−(aq)  are  −350.6, −128.3  and  −216.3kcal . The heat of reaction (in kcal) is minus:

rom these data,→+Srhombic  O2g  SO2g =ΔH°rxn−296.06kJmol→+Smonoclinic  O2g  SO2g =ΔH°rxn−296.36kJmolCalculate the enthalpy change for the transformation:→Srhombic  Smonoclinic(Monoclinic and rhombic are different allotropic forms of elemental sulfur.)Be sure your answer has the correct number of significant digits.kJmol

determine the empirical formula of barium sulfide.