The heat of combustion of is . If the heat of formation of and are and then the heat of formation of is:

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Detailed Solution

Concept- The quantity of energy generated when 1 mole of a substance burns completely with an excess of oxygen is known as the heat of combustion. It is symbolised by

. The energy that is emitted or absorbed when 1 mole of a substance is generated from its constituent parts in their most stable condition is known as the heat of formation.

is a representation of it. The energy that is absorbed by 1 mole of a substance as it separates into its isolated gaseous phase is known as the heat of atomization. It is symbolised by

.
As we have, heat of combustion of

which means

. Let it to be reaction number $1 .$
The reverse of this equation can be given as:

.
Let it be reaction number 2 .
As given, heat of formation of

and

are

and

, it can be given
As:

and

.
The heat of formation of

can be given as:

.
This desired reaction can also be given as: = equation