• 2022-06-07
    已知MnO2 (s) = MnO (s) + 1/2 O2 (g) r HmΘ = 134.8 kJ∙mol−1,MnO2 (s) + Mn (s) = 2MnO (s) r HmΘ = -250.1 kJ∙mol−1,则MnO2的标准摩尔生成热f HmΘ为( )
    A: -519.7 kJ∙mol−1
    B: 519.7 kJ∙mol−1
    C: 317.5 kJ∙mol−1
    D: -317.5 kJ∙mol−1