Question

Calculate the enthalpy of faormation of CO from the following data.:

C+O₂ -------------CO₂ ,delta H = -393.3 kj/mol

CO + 1/2 O2 --------------CO2 delta h= -282.8 kj/mol

Answer 1

C+O₂ $\to$ CO₂ ,$∆$Hco₂ = -393.3 kJ/mol = $∆$H₁
CO₂ $\to$CO + 1/2 O₂ Enthalapy of dissociation of CO₂ = 282.8 kj/mol = $∆$H₂

Over all reaction
C+ 1/2 O₂ $\to$CO , $∆$H₃
$∆$H₃ = $∆$ H₁ + $∆$H₂

$∆$H₃ = -393.3 kJ/mol + 282.8 kJ/mol = -110.5 kJ/mol