Q.
For the given heat of reaction,
$\left(i\right)C\left(s\right)+O_{2}\left(g\right)=CO_{2}\left(g\right)+97 kcal$
$\left(ii\right)CO_{2}\left(g\right)+C\left(s\right)=2CO\left(g\right)-39 kcal$
the heat of combustion of $CO\left(g\right)$ is:
Thermodynamics
Solution: