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¢Ú2H2(g)£«O2(g) = 2H2O(l)              ¡÷H2 = £­570 kJ¡¤mol£­1£»  
¢Û2C2H2(g)£«5O2(g) = 4CO2(g)+ 2H2O(l)   ¡÷H3 = £­2600 kJ¡¤mol£­1£»
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