摘要：已知充分燃烧ag乙炔气体时生成0.5mol二氧化碳气体和液态水.并放出热量bkJ,则乙炔燃烧的热化学方程式正确的是 A.2C2H2(g)+5O2(g)=4CO2(g)+2H2O(l);△H=-4bkJ/mol B. C2H2(g)+5/2O2(g)=2CO2(g)+H2O(l);△H=-2bkJ/mol C. 2C2H2(g)+5O2(g)=4CO2(g)+2H2O(l);△H=-2bkJ/mol D. 2C2H2(g)+5O2(g)=4CO2(g)+2H2O(l);△H=bkJ/mol
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已知充分燃烧ag乙炔气体时生成0.5mol二氧化碳气体和液态水，并放出热量bkJ，则乙炔燃烧的热化学方程式正确的是 | |
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A． |
2C2H2(g)＋5O2(g)＝4CO2(g)＋2H2O(l);△H＝－4bkJ/mol |
B． |
C2H2(g)＋5/2O2(g)＝2CO2(g)＋H2O(l);△H＝－2bkJ/mol |
C． |
2C2H2(g)＋5O2(g)＝4CO2(g)＋2H2O(l);△H＝－2bkJ/mol |
D． |
2C2H2(g)＋5O2(g)＝4CO2(g)＋2H2O(l);△H＝bkJ/mol |
O2(g)=CO(g)的反应热为110.5kJ/mol，说明碳的燃烧热为110.5kJ