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已知热化学方程式:H2O(g)===H2(g)+1/2O2(g) ΔH=+241.8 kJ/molH2(g)+1/2O2(g)===H2O(l) ΔH=-285.8 kJ/mol,当1 g液态水变为水蒸气时,其热量变化是()
A.ΔH=+88 kJ/mol
B.ΔH=+2.44 kJ/mol
C.ΔH=-4.98 kJ/mol
D.ΔH=-44 kJ/mol
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
B、ΔH=+2.44 kJ/mol
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.ΔH=+88 kJ/mol
B.ΔH=+2.44 kJ/mol
C.ΔH=-4.98 kJ/mol
D.ΔH=-44 kJ/mol
B、ΔH=+2.44 kJ/mol
A.ΔH=+88 kJ/mol
B.ΔH=+2.44 kJ/mol
C.ΔH=-4.98 kJ/mol
D.ΔH=-44 kJ/mol
A.-488.3 kJ/mol
B.+488.3 kJ/mol
C.-244.15 kJ/mol
D.+244.15 kJ/mol
A.-252.9 kJ·mol-1
B.+252.9 kJ·mol-1
C.-604.5 kJ·mol-1
D.+604.5 kJ·mol-1
A.-(a-b) kJ·moL-1
B.-(a+b) kJ·moL-1
C.-(5a-0.5b) kJ·moL-1
D.-(10a-b) kJ·moL-1
A.+478.7 kJ/mol
B.-764.5 kJ/mol
C.-478.7 kJ/mol
D.+764.5 kJ/mol
A.1∶1
B.1∶3
C.1∶4
D.2∶3
A.1:3
B.3:1
C.1:4
D.1:1
A.热化学方程式中化学计量数表示分子数
B.该反应ΔH2大于零
C.该反应ΔH2=-571.6 kJ·mol-1
D.该反应与上述反应属于可逆反应
A.=196.64 kJ
B.=98.32 kJ
C.<196.64 kJ
D.>196.64 kJ
0.05molCH4完全燃烧生成CO2气体和液态H2O时放出44.5kJ的热量。则下列热化学方程式中正确的是()。
A.2CH4(g)+4O2=2CO2(g)+4H2O(l)H=890kJ•mol-1
B.CH4+4O2=2CO2+4H2OH=890kJ•mol-1
C.CH4(g)+2O2=CO2(g)+2H2O(l)H=890kJ•mol-1
D.2CH4(g)+4O2=2CO2(g)+4H2O(l)H=890kJ•mol-1