8/17/2019 CPC Assignment 2

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ASSIGNMENT -2

1.  The gas having the following composition is at a temperature of 775 K .SO2 = 7.09%, O2 =10.55%, SO3 = 0.45%, and N2 = 81.91%.Calculate the heat content of 1 k mole gas mixture

over 298 K using heat capacity data given below:

Gas a b×103  c×10

6  d×10

9 

SO2  24.77 62.94 -44.25 11.12

O2  26.02 11.75 -2.34 -0.56

SO3  22.03 121.62 -91.86 24.36

N2  29.59 -5.14 13.18 -4.96

2. 

Flue 

gas leaving the boiler stack at 523 K has the followingcomposition on mole basis:

CO2 =11.3%, H2O = 13.04%, O2 = 2.17%, and N2 =73.48%.Calculate the heat lost in

1 K mole of gas mixture above 298 K using heat capacity data given below :

Gas a b×103  c×10

6  d×10

9 

CO2  21.36 64.28 -41.05 9.79

H2O 32.49 0.07 13.21 -4.54

O2  26.02 11.75 -2.34 -0.56

N2  29.59 -5.41 13.18 -4.96

3.  In a process to manufacture HCl, common salt and sulfuric acid are heated together. TheHCl gas produced is cooled and absorbed in water to produce 31.5% HCl (by weight). SomeHCl is lost during absorption. To produce 1 ton of 31.5% HCl, 550 kg of common salt and

480 kg of 98% H2SO4 were taken. The reaction goes to completion. Calculate:

i.  Which reactant is in excess?ii.  What is the amount of HCl lost?

iii.  Calculate the composition and quantity of residue left behind when 50% of water is

distilled off.