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Grade: 12
        
the molar heat capacity of CDDO is 10cal at 1000K .The change in entropy associated with cooling of 32g ofCDDO vapour from 1000K to 100K at constant pressure will be
7 months ago

Answers : (2)

Arun
12335 Points
							
Dear Prasad
 
Change in entropy =
 
Delta S = Cp ln (T2/T1) - R ln (P2/P1)
 
But P1 = P2 hence
 
Delta S = Cp ln (T2/T1) = 10 ln (100/1000)
 = - 10 ln 10 = - 10 * 2.303 log 10
= - 23.03 cal/degree
 
Regards
Arun (askIITians forum expert)
7 months ago
Rohit Sharma
63 Points
							
As we know,
Delta S = Cp ln(V2/v1) + R ln (p1/p2
as its constant pressure then,
Entropy = Cp ln(T2/T1)
You know all the values and can find the entropy easily,
7 months ago
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