Use table B.8 in elementary principles of chemical processes (pdf version can be

Question

Use table B.8 in elementary principles of chemical processes (pdf version can be found online) 3rd edition.

100 mol of a stack gas leaving a combustion process has a composition of 20.0 mol% C02,13.3 mol% CO, and 66.7 mol% H20 and is at 400 C and 1 atm. Prior to venting out into the environment, the stack gas is cooled to 100 C and 1 atm, and all of the components stay as gases. How much heat is removed from the stack gas for this process? Table B.8 will be useful. 563 kJ 231 kJ 433 kJ 493 kJ 512 kJ 112 kJ

Explanation / Answer

average Specific heat of CO= 3.376*8.314 j/mol=28.06 J/mol, CO2= 5.457*8.314=45.3695 J/mole and

H2O= 3.470*8.314=28.84 j/mole

heat to be removed= {specifc heat of CO2* moles of CO2+ specific heat of CO* moles of CO+ specific heat of water* moles of water}(400-100)

(45.3695*20+13.3*28.06+66.7*28.84)300=961488.7 J = 961.4887 Kj

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