1.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), △H 2= -393.5kJ/mol 则C(s)+CO2 (g)=2CO(g) 的△H
A.283.5kJ/mo B 172.5kJ/mol C -172.5kJ/mol D.-504 kJ/mol
2.甲烷是一种高效清洁的新能源,0.25mol甲烷完全燃烧生成液态水时放出222.5KJ热量,则下列热化学方程式中正确的是
A.2CH4(g) + 4O2(g) == 2CO2(g) + 4H2O(l);ΔH== +890KJ•mol—1
B. CH4(g) + 2O2(g) == CO2(g) +2H2O(l);ΔH== +890KJ•mol—1
C. CH4(g) + 2O2(g) == CO2(g) +2H2O(l);ΔH== -890KJ•mol—1
D. 2CH4(g) + 4O2(g) == 2CO2(g) + 4H2O(l);ΔH== -890KJ•mol—1
3锌铜原电池产生电流时,阴离子