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C2H5OH + 7/2O2 --> 2CO2 + 3H2O ΔH = -1380kj/mol
ΔH reaksi = ∑ΔHf kanan - ∑ΔHf kiri
-1380 = [(2x -394) + (3x -286)] - ΔHf C2H5OH
ΔHf C2H5OH = -266 kj/mol
reaksi pembentukan C2H5OH:
2C + 3H2 + 1/2O2 --> C2H5OH ΔH = -266kj/mol
jadi ΔHf C2H5OH = -266kj/mol