[llagetias]

For this entropy problem, I am having trouble setting up an equation for the conditions. I know what to do when pressure is constant but its not for this problem? Does anyone have any tips to get started? Should I use a a path varying one variable at a time?

3.10 Fin deltaS for the conversion of 1.00 mol of ice at 0°C and
1.00 atm to 1.00 mol of water vapor at 100°C and 0.50 atm. Use
data from Prob. 2.49.
(Levine, Ira. Physical Chemistry, 6th Edition. McGraw-Hill Higher Education/CourseSmart, 06/01/2008. 105).
<vbk:PBK0077272692#page(105)>


2.49 For this problem use 333.6 J/g and 2256.7 J/g as the la-
tent heats of fusion and vaporization of water at the normal
melting and boiling points, c=4.19 J /g K for liquid
water, density =0.917 g/cm3 for ice at 0°C and 1 atm, density =1.000 g/cm3
and 0.958 g/cm3for water at 1 atm and 0°C and 100°C, respec-
tively.
(Levine, Ira. Physical Chemistry, 6th Edition. McGraw-Hill Higher Education/CourseSmart, 06/01/2008. 76).
<vbk:PBK0077272692#page(76)>

For this temperature scale problem, I have no idea what they mean when they say "take the square root". Does it mean take the square root of phi(t hot)/phi(t cold)? And if so how does this help find the steam point and ice point of the temperature scale? Any advice would be greatly appreciated.

3.24 Willard Rumpson (in later life Baron Melvin, K.C.B.)
defined a temperature scale with the function fin (3.43) as
“take the square root” and with the water triple-point tempera-
ture defined as 200.00°M. (a) What is the temperature of the
steam point on the Melvin scale? (b) What is the temperature of
the ice point on the Melvin scale?

(Levine, Ira. Physical Chemistry, 6th Edition. McGraw-Hill Higher Education/CourseSmart, 06/01/2008. 106).
<vbk:PBK0077272692#page(106)>