• 2022-07-24
    下列反应中∆rHmƟ等于产物∆fHmƟ的是( )。
    A: N2(g)+3H2(g) = 2NH3(g)
    B: C6H6(g) +15/2O2(g) = 6CO2(g) + 3H2O(l)
    C: 1/2H2(g)+ 1/2Br2(l) = HBr(g)
    D: CO2(g) + CaO(s)=CaCO3(s)
  • C

    内容

    • 0

      已知 C2H2(g)+5/2O2(g) = 2 CO2(g)+H2O(l) ΔrHmΘ1 C(s)+O2(g) = CO2(g) ΔrHmΘ2 H2(g)+1/2O2(g) = H2O( l ) ΔrHmΘ3则ΔfHmΘ (C2H2,g)与ΔrHmΘ1、ΔrHmΘ2、ΔrHmΘ3的关系为 A: ΔrHmΘ1+ΔrHmΘ2+ΔrHmΘ3 B: 2ΔrHmΘ2-ΔrHmΘ3-ΔrHmΘ1 C: 2ΔrHmΘ2+ΔrHmΘ3+ΔrHmΘ1 D: 2ΔrHmΘ2+ΔrHmΘ3-ΔrHmΘ1

    • 1

      下列哪一个反应的Kc和Kp的数值相等 ( ) A: 3 H2 (g) + N2 (g) = 2 NH3 (g) B: CaCO3 (s) = CaO (s) + CO2 (g) C: H2 (g) + I2(g) = 2 HI (g) D: 2 F2 (g) + 2 H2O (l) = 2 </spa

    • 2

      下列哪一个反应的Kc和Kp的数值相等 ( ) A: 2 F2 (g) + 2 H2O (l) = 2 </spa B: H2 (g) + I2(g) = 2 HI (g) C: 3 H2 (g) + N2 (g) = 2 NH3 (g) D: CaCO3 (s) = CaO (s) + CO2 (g)

    • 3

      下列哪一个反应的Kc和Kp的数值相等 ( ) A: 3 H2 (g) + N2 (g) = 2 NH3 (g) B: H2 (g) + I2(g) = 2 HI (g) C: CaCO3 (s) = CaO (s) + CO2 (g) D: 2 F2 (g) + 2 H2O (l) = 2 </spa

    • 4

      【单选题】由下列数据确定CH 4 (g)的为Δ f H m Θ 为 () C ( 石墨 ) +O 2 (g)=CO 2 (g) Δ r H m Θ =-393.5kJ·mol - 1 H 2 (g)+1/2O 2 (g)=H 2 O(l) Δ r H m Θ =-285.8kJ·mol - 1 CH 4 (g)+2O 2 (g)=CO 2 (g)+2H 2 O ( l ) Δ r H m Θ =-890.3kJ·mol - 1 A. 211 kJ·mol -1 B. -74.8kJ·mol - 1 C. 890.3 kJ·mol - 1 D. 缺条件,无法算