- The entropy change associated with the
conversion of 1 kg of ice at 273 K to water
vapours at 383 K is:
(Specific heat of water liquid and water
vapour are 4.2 kJ K-1 kg and 2.0 kJ K-1 kg 1;
heat of liquid fusion and vapourisation of
water are 344 kJ kg-' and 2491 kJ kg-1,
respectively).
(log 273=2.436, log 373=2.572, log 383=
2.583)
1) 7.90 kJ kg-1 K-1 2) 2.64 kJ kg- K-
3) 8.49 kJ kg- K-1 4) 9.26 kJ kg-' K-
Answers
Answered by
0
Answer: 2
Explanation:
ANSWER
ΔS=
T
ΔH
Transition
ΔS=nC ln
T
i
T
f
=ms ln
T
i
T
f
n= no. of moles, m= mass, C=molar heat capacity, s= specific heat capacity
Phase change path
H
2
O(s)
ΔS
1
H
2
O(l)
ΔS
2
H
2
O(l)
ΔS
3
H
2
O(g)
ΔS
4
H
2
O(g)
Δs
1
=
273
ΔH
fusion
=
273
334
=1.22
Δs
2
=4.2 ln
273
363
=1.31
Δs
3
=
2491
ΔH
vap
373=6.67
Δs
4
=2.0 ln
373
383
=0.05
Δs
total
=Δs
1
+Δs
2
+Δs
3
+Δs
4
=9.25kJkg
−1
K
−1
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