Problem 4: Heat of formation of compound

Given the following heats formation (in cal /g.mole):




 


Write each of these in the form of a thermo chemical equation. From these equations determine the heat of formation of  per kilogram of .

This type of problem is very useful in metal extraction. In cases when heat of formation of a compound is not known, then it can be determined from the heat of formation of different stepwise reactions leading to formation of compound.

In the above problem one has to find heat of formation of

Let us form the   Thermo chemical   equations:

	(1)
	(2)
	(3)

Subtraction equation 1 and 3   from equation 2, w.ge 1