Please show all work. I\'m offering maximum points. The Question: What is the am

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The Question: What is the amount of ethylene glycol needed to keep temperature of mixture at 25 C?

Two streams containing pyridine and acetic acid at 25 degree C are mixed and fed into a heat exchanger. Due to toe heat-of-mixing effect, it is desired to reduce the temperature after mixing to 25 degree C using a stream of chilled ethylene glycol as indicated in the diagram The heat capacity of the ethylene glycol at these conditions is approximately 2.8 kJ/kg K), and the enthalpy change of mixing (Amu H) is given below.

Explanation / Answer

As 1kmol of pyridine is mix with 1kmol of acetic acid.

Mole fraction of pyridine=1/(1+1)=0.5

From the data provided,

?mixH=-4772 J/mol=-4.772 kJ/mol

Heat released per minute= moles of mixture*?mixH

=2*-4.772=-9.544 kJ/min

Let x kg of ethylene glycol be needed.

Change in temp=25-5=20?

Heat absorbed=mC?T=x*2.8*20=56x

Now heat absorbed by glycol= heat of mixing for mixture to be at costant temp

56x=9.554

X=0.170 kg/min

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