A rigid tank of volume 03 nr contains water initially at its critical point. The

Question

A rigid tank of volume 03 nr contains water initially at its critical point. The water is now cooled to 150degreeC. What mass of water is in the tank? Has the average specific volume of this water changed during the cooling process? Find the mass of liquid water and the mass of water vapor in the tank at the end of the process. Find the volume of liquid water and the volume of water vapor in the tank at the end of the process. Find the quality of the final mixture. Is it meaningful to talk about the quality of the water at the initial state of this process? Why or why not? Find the enthalpy change of the water in the tank.

Explanation / Answer

Density of water: 1,000 kg/m³

mass = density x volume

mass = 1000 kg/m³ x 0.3 m3 = 300 kg.

The enthalpy change upon converting 1.00 mol of ice at -25°C to water vapor (steam) at 125°C under a constant pressure of 1 atm.

The specific heats of ice, water, and steam are 2.09 J/g-K, 4.18 J/g-K, and 1.84 J/g-K, respectively.

For H2O, Hfus = 6.01 kJ/mol, and Hvap = 40.67 kJ/mol.

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