问题
选择题
已知在298K时下述反应的有关数据:
C(s)+1/2 O2(g)=CO(g) △H1 = -110.5kJ/mol,
C(s)+O2(g)=CO2(g) △H2= -393.5kJ/mol ,
则C(s)+CO2(g)=2CO(g) 的△H为 [ ]
A.+283.5kJ/mol
B.+172.5kJ/mol
C.-172.5kJ/mol
D.-504 kJ/mol
答案
答案:B
已知在298K时下述反应的有关数据:
C(s)+1/2 O2(g)=CO(g) △H1 = -110.5kJ/mol,
C(s)+O2(g)=CO2(g) △H2= -393.5kJ/mol ,
则C(s)+CO2(g)=2CO(g) 的△H为 [ ]
A.+283.5kJ/mol
B.+172.5kJ/mol
C.-172.5kJ/mol
D.-504 kJ/mol
答案:B