A.CH3OH(l) +O2(g) ="=" CO2(g) + 2H2O(l);△H=-726.4kJ/mol |
B.2CH3OH(l) + 3O2(g) ="=" 2CO2(g) + 4H2O(g);△H=-1452.8kJ/mol |
C.CH3OH(l) +O2(g) ="=" CO2(g) + 2H2O(l);△H=726.4kJ/mol |
D.2CH3OH(l) + 3O2(g) ="=" 2 CO2(g) + 4H2O(l);△H=-1452.8kJ/mol |
A.ΔH3=(ΔH1+ΔH2) | B.ΔH3=ΔH2-ΔH1 |
C.ΔH3=2(ΔH2+ΔH1) | D.ΔH3=(ΔH2-ΔH1) |
A.2mol H2完全燃烧生成水时放出571.6 kJ的热量 |
B.1mol 液态水完全分解生成H2和O2时放出285.8kJ的热量 |
C.2个氢分子和1个氧分子完全燃烧生成液态水时放出571.6 kJ的热量 |
D.上述热化学方程式可表示为H2(g)+ 1/2O2(g)=H2O (1),△H=-285.8 kJ·mol-1 |
A.-386kJ·mol-1 | B.+386kJ·mol-1 |
C.-746kJ·mol-1 | D.+746kJ·mol-1 |
A.△H1=△H2=△H3=△H4 | B.△H1+△H2=△H3+△H4 |
C.△H1+△H2+△H3=△H4 | D.△H1=△H2+△H3+△H4 |
A.+ 488.3 kJ/mol | B.-488.3 kJ/mol |
C.-244.15 kJ/mol | D.+ 244.15 kJ/mol |
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