Problem 50

Given information

The enthalpy change of individual reactions is given as follows:

     -----------------(1)

    -----------------(2)

 -----------------(3)

Step-by-step explanation

The reaction with unknown enthalpy change is as follows:

------------------(4)

Multiplication of the equation (3) with (2) as follows:

                          ------------(5)

Addition of equations (2) and (5) as follows:

--------------(6)  

Subtracting equation (1) from (6) as follows:

-------------------(7)