3.60 As shown in Fig. P3.60, a tank open to the atmosphere initially contains 2 lb of liquid water at 80F and 0.4 lb of ice at 32F. All of the ice melts as the tank contents attain equilibrium. If no significant heat transfer occurs between the tank contents and their surroundings, determine the final equilibrium temperature, in F. For water,

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3.60 As shown in Fig. P3.60, a tank open to the atmosphere initially contains 2 lb of liquid water at 80°F and 0.4 lb of ice at 32°F. All of the ice melts as the tank contents attain equilibrium. If no significant heat transfer occurs between the tank contents and their surroundings, determine the final equilibrium temperature, in °F. For water, the spe- cific enthalpy change for a phase change from solid to liquid at 32°F and 1 atm is 144 Btu/lb. FIGURE P3.60 Patm 1 atm = Liquid water, m = 2 lb, initially at 80°F Ice, m = 0.4 lb (total mass), initially at 32°F

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3.60 As shown in Fig. P3.60, a tank open to the atmosphere initially contains

2 lb

of liquid water at

8 0^{\circ} F

and

0.4 lb

of ice at

3 2^{\circ} F

. All of the ice melts as the tank contents attain equilibrium. If no significant heat transfer occurs between the tank contents and their surroundings, determine the final equilibrium temperature, in

^{\circ} F

. For water, the specific enthalpy change for a phase change from solid to liquid at

3 2^{\circ} F

and

1 atm

is

144 Btu / lb

.

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