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b Hf° (H2O)
delta H = delta H hasil reaksi- delta H reaksi
1.364 = 3(Hf° H2O) + 2( Hf° CO2 ) - [ (Hf°C2H5OH)+ Hf ° H2O)
1.364 = 3(Hf° H2O) + 2×-393 - ( -277) +0
1364-277+786 = 3(Hf° H2O)
1873/3= Hf° H2O
Hf° H2O= 624,3 Kj/mol