单选题 适中0.65 引用7 组卷196
已知①
②
则反应的等于
②
则反应的等于
A.-110.5kJ/mol | B.+110.5 kJ/mol | C.-676.5 kJ/mol | D.+676.5 kJ/mol |
2020高二下·贵州·学业考试
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已知:①2CO2(g)+4H2(g)═2CH3OH(g)+O2(g) △H=+385.8kJ/mol
②2H2(g)+O2(g)═2H2O(l) △H=−571.6kJ/mol,则CH3OH(g) +O2(g)═CO2(g)+2H2O(l)的△H为
②2H2(g)+O2(g)═2H2O(l) △H=−571.6kJ/mol,则CH3OH(g) +O2(g)═CO2(g)+2H2O(l)的△H为
A.+478.7kJ/mol | B.−764.5 kJ/mol | C.−478.7kJ/mol | D.+764.5kJ/mol |
已知下列热化学方程式
(1)C(s)+1/2O2(g)===CO(g) △H1=-110.5kJ/mol
(2)2H2(g)+O2(g)===2H2O(g) △H2=-483.6 kJ/mol
由此可知 C(s)+H2O(g) ===CO(g)+H2(g)ΔH3 ,则ΔH3等于
(1)C(s)+1/2O2(g)===CO(g) △H1=-110.5kJ/mol
(2)2H2(g)+O2(g)===2H2O(g) △H2=-483.6 kJ/mol
由此可知 C(s)+H2O(g) ===CO(g)+H2(g)ΔH3 ,则ΔH3等于
A.+131.3 kJ/mol | B.+373.1 kJ/mol |
C.-131.3 kJ/mol | D.-373.1 kJ/mol |
已知:①C(s)+O2(g)=CO2(g)△H1= akJ•mol﹣1
②S(s)+2K(s)=K2S(s)△H2= bkJ•mol﹣1
③2K(s)+N2(g)+3O2(g)=2KNO3(s)△H3= ckJ•mol﹣1
则S(s)+2KNO3(s)+3C(s)=K2S(s)+N2(g)+3CO2(g)的热效应△H为( )
②S(s)+2K(s)=K2S(s)△H2= bkJ•mol﹣1
③2K(s)+N2(g)+3O2(g)=2KNO3(s)△H3= ckJ•mol﹣1
则S(s)+2KNO3(s)+3C(s)=K2S(s)+N2(g)+3CO2(g)的热效应△H为( )
A.(a+b﹣c)kJ•mol﹣1 | B.(3a+b﹣c)kJ•mol﹣1 |
C.(c﹣a﹣b)kJ•mol﹣1 | D.(c﹣3a﹣b)kJ•mol﹣1 |
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