Solid fuel used in rocket is a mixture of Fe _ 2 O _ 3 and Al (in...

Molten iron can be prepared by alumino thermite process as shown below.

${Fe}_{2}{O}_{3} + 2Al \to 2Fe + {Al}_{2}{O}_{3}$

The iron oxide and aluminium metal ratio is $1: 2$ in the above reaction.

Now, the Enthalpy of the reaction is equal to the difference of enthalpy of formation of products to the enthalpy of formation of reactants.

${\Delta H}_{\text{reaction}}^{0} = - 1700 + ( 840 )$

Ratio of ${Fe}_{2}{O}_{3}$ and $Al$

$= 160: 54$

$= 2 . 96in214gm$mixture

$∴ \dfrac{\Delta H °}{1gm\text{mixture}} = \dfrac{- 860}{214} = - 4kJ / gram$