Considere as entalpias padrão de formação de cada substancia  C2 H50 H (L) ΔH = -277,5 KJ/ mol
Co2  ⇒ΔH= -393,3 kJ/ mol
H20   ⇒ΔH= -285,5 KJ/ mol

Determine a variação de entalpia 
  formula C2 H5OH (l)+ 30 2 (g) ⇒2 Co2 (g) + 3H2O(l)
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