Copper metal is made by smelting copper ores. Calculate ?S sys , ?S surr , and ?
ID: 886154 • Letter: C
Question
Copper metal is made by smelting copper ores. Calculate ?Ssys, ?Ssurr, and ?Suniv at 25°C given the following thermodynamic values.
I know Delta system= prod-react
delta surr is -delta syst/ T
and delta univ= delta sys + delta Surr
The answers i calculated are
(Note: delta H= -216.5 kj/mol)
delta System= 11.6 J/K
delta surr = 726.51 J/K
delta uni= 738.11 J/K
Can you check my work and show an explanation
Cu2S(s)O21g) 2 2 Cu(s) SO2(g) AH (kJ/mol) -79.5 0 S° (J/mol-K) 120.9 205.0 0 296.8 33.1 248.1Explanation / Answer
Cu2S(s) + O2(g) ---> 2Cu(s) + So2(g)
DSsys = Sproducts - Sreactants
= (248.1+(2*33.1))-(120.9+205.0)
= -11.6 j/mol.k
DHrxn = (-296.8)-(-79.5)
= -217.3 kj/mol
qsurr = 217.3 kj/mol
if DH is -ve . energy releases to surroundings.so that entropy of
universe increases.
DSsurroundings = q/T = (217.3*1000)/298
= 729.2 j/mol.k
Dsuni = DSsys + DSsurr
= (-11.6)+(729.2)
= 717.6 j/mol.k
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