Module 1:Basics of energy balance
  Lecture 8: Thermo chemistry applications in metal extraction
 

 

Problem 2: Heat of reaction in extraction of

Calculate  at 1250 K for the following reaction

. Use the data of problem 1 for latent heats

Components

 (cal/g.mol)

Cp (cal/g.mol  K)

CO(g)

       -26420

6.79+(0.98x10-3 T) – (0.11 x 105 T -2)

Zn(n)

        ------

7.50

Zn(g)

        ------

5.00

ZnS(s)

          0

5.35 +(2.40 x 10-3 T )

C(s)

        -----

4.10 + (1.02 x 10-3 T) –(2.10 x 105 T -2 )

ZnS(s)

      -48200

12.16+(1.24x10-3T)-(1.66 x 105T -2)

CaO

      -151600

11.86+(1.08 x 10-3T)-(1.66 x 105T -2)

CaS

      -110000

10.20+(3.8 x 10-3 T)

 

Solution   :

First calculate

Now calculate sensible heat in products .The products are raised from a reference   temperature 298 k to 1250 K .Use respective Cp values and integrate from 298 K to 1250 K.



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