已知在298K时下述反应的有关数据：C(s)+1/2O2(g)===CO(g)△H1=－110.5kJ·mol-1C(s)+O2(g)===CO2(g)△H2=－393.5kJ·mol-1则C(s)+CO2(g)===2CO(g)的△H为[]A．+283.5kJ·mol-1B．+172.

Question

已知在298K时下述反应的有关数据：
C(s)+1/2O ₂ (g) === CO(g) △H ₁ = －110.5 kJ·mol ^-1
C(s)+O ₂ (g) === CO ₂ (g) △H ₂ = －393.5 kJ·mol ^-1
则C(s)+CO ₂ (g) ===2CO(g) 的△H 为

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A．+283.5 kJ·mol ^-1
B．+172.5 kJ·mol ^-1
C．-172.5 kJ·mol ^-1
D．-504 kJ·mol ^-1

Answer 1

B