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(d) Similarly, the cooling of the originalwater involves an entropy change of
339.67
353.15
'
339.67
'ln
21.2 J/K
353.15
cm dT
cm
T
§·
==
−
¨¸
©¹
³
(e) The net entropy change in this calorimetry experiment is found by summing the
previous results; we find (by using more precise values than those shown above)
ǻ
S
net
=
4.39 J/K.
20. (a) We denote the mass of the ice (which turns to water and warms to
T
f
) as
m
and the
mass of originalwater (which cools from 80º down to
T
f
) as
m
′
.
From
Σ
Q
= 0 we have
L
F
m
+
cm
(
T
f
– 0º) +
cm
′
(
T
f
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Mass

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