What will be the effect of the indicated changes on the SO2 concentration for the following system at equilibrium 2PbS(s) + 3O2(g) ↔ 2PbO(s) + 2SO2(g) ΔH = -173 kJ/mol Change [SO2] would increase [SO2] would decrease [SO2] unchanged Addition of O2 (g)       Addition of PbO2 (s)       Container volume compression

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