Question no. 3

Q. 3  Find the heat of formation of ethyl alcohol from following data :

$$\begin{gathered} C\left(s\right)+O_2 \left(g\right) \to C{O}_2 \left(g\right). △H = -94 kcal \\ {H}_2 \left(g\right) + \frac{1}{2} O_2 \left(g\right) \to H_{2}O \left(\mathcal{l}\right). △H = -68 kcal \\ {C}_2{H}_{5}OH \left(\mathcal{l}\right) + 3O_2 \left(g\right) \to 2C{O}_2 \left(g\right) + 3 H_{2}O \left(\mathcal{l}\right). △H = -327 kcal \end{gathered}$$