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3.19 A two-phase liquid–vapor mixture of ammonia has a specific volume of 1.0 ft3/lb. Determine the quality if the temperature is (a) 100°F, (b) 0°F. Locate the states on a sketch of the T–y diagram.
3.20 A two-phase liquid–vapor mixture of a substance has a pressure of 150 bar and occupies a volume of 0.2 m3. The masses of saturated liquid and vapor present are 3.8 kg and
4.2 kg, respectively. Determine the specific volume of the mixture, in m3/kg.
3.21 As shown in Fig. P3.21, a closed, rigid cylinder contains different volumes of saturated liquid water and saturated water vapor at a temperature of 150°C. Determine the quality of the mixture, expressed as a percent.

T = 150°C 60

Fig. P3.21

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