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已知:2H2S(g)+O2(g)=2S(s)+2H2O(l);ΔH=-akJ/mol;
2H2S(g)+3O2(g)=2SO2(g)+2H2O(l);ΔH=-bkJ/mol
则H2S与SO2两种气体转化为固体硫的热化学方程式为________.