單項選擇題已知2PbS(s)+3O2(g)===2PbO(s)+2SO2(g)的ΔrHΘm=-843.4kJ˙mol-1,則該反應(yīng)的qv值是多少kJ˙mol-1?()

A.840.9
B.845.9
C.-845.9
D.-840.9


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