A mass of 3 kg of water at 50oC has been heated to vapour at a...

A mass of 3 kg of water at 50oC has been heated to vapour at a temperature of 125oC in an oven. The specific heat capacities for water in the form of liquid (Cw), solid (Cice) and gas (Cv) are 4.187 kJ.kg-1.K-1, 2.108 kJ.kg-1.K-1, and 1.996 kJ.kg-1.K-1, respectively. Also, latent heats of fusion and vaporization are given as 3.33 x 105 J.kg-1 and 2.22 x 103 J.kg-1, respectively. NB: Number your answers correctly!

(a) What would be the entropy of water in the form of liquid, SL? (5)

(b) Calculate the entropy of the system when it changes its state/phase to vapour, Sv. (3)

(c) Compute the total entropy, STotal, of water between 50 oC and 125 oC. (5)

Expert Solution

genius_generous answered 1 year ago

3 Kg mass of water is heated to a temperature of 99.5 C at 1 bar...

3 Kg mass of water is heated to a temperature of 99.5 C at 1 bar of pressure. It is slowly poured into a heavily insulated beaker containing 7.5 Kg of water at a temperature and pressure of 4 C, 1 bar, respectively. The specific heat of the water, an incompressible material is, c = 4.1 KJ/(Kg K). The beaker can be considered to be an adiabatic system. The two water mass’ reach an equilibrium temperature. There is no kinetic...

In a thermally isolated mixing chamber cold water at 50oC and 1MPa is heated steadily by...

In a thermally isolated mixing chamber cold water at 50oC and 1MPa is heated steadily by a steam at 200oC and 1MPa. The mixture leaves the chamber at 150oC. 1.mass ratio of the hot and cold streams 2 entropy generation rate per unit cold water mass flow rate

A mass of 5 kg of saturated water vapor at 150 kPa is heated at constant...

A mass of 5 kg of saturated water vapor at 150 kPa is heated at constant pressure until the temperature reaches 200°C, the the boundary work in KJ is done by the steam during this process is closest to?

An object has a mass in air of 0.0832 kg, apparent mass in water of 0.0673...

An object has a mass in air of 0.0832 kg, apparent mass in water of 0.0673 kg, and apparent mass in another liquid of 0.0718 kg. What is the specific gravity of the other liquid?

If 250 g of water is heated by 6 K during the experiment and the water-mass...

If 250 g of water is heated by 6 K during the experiment and the water-mass equivalent of the coil is 2.5 g, how many calories of energy has the water (and coil) absorbed? The specific heat capacity (using the archaic units of calories) is: 1 cal/(g K).

A pump operating at steady state receives 1.5 kg/s of liquid water at 50oC, 1.5 MPa....

A pump operating at steady state receives 1.5 kg/s of liquid water at 50oC, 1.5 MPa. The pressure of the water at the pump exit is 14 MPa. The magnitude of the work required by the pump is 25.2 kW. Stray heat transfer and changes in kinetic and potential energy are negligible. Determine the work required by a reversible pump operating with the same conditions, in kW, and the isentropic pump efficiency.

A rod made of nickel with a mass of 0.80 kg is heated to 850°C, then...

A rod made of nickel with a mass of 0.80 kg is heated to 850°C, then dropped into 7.00 kg of water at 11°C. What is the total change in entropy (in J/K) of the rod-water system, assuming no energy is lost by heat from this system to the surroundings? The specific heat of nickel is 440 J/(kg · K), and the specific heat of water is 4,186 J/(kg · K). (Hint: note that dQ = mcdT.)

A block made of copper with a mass of 0.90 kg is heated to 800°C, then...

A block made of copper with a mass of 0.90 kg is heated to 800°C, then dropped into 5.00 kg of water at 11°C. What is the total change in entropy (in J/K) of the block-water system, assuming no energy is lost by heat from this system to the surroundings? The specific heat of copper is 387 J/(kg · K), and the specific heat of water is 4,186 J/(kg · K). (Hint: note that dQ = mcdT.)

At 500°C and 93.2 kPa, the mass density of sulfur vapour is 3.710 kg m-'. What...

At 500°C and 93.2 kPa, the mass density of sulfur vapour is 3.710 kg m-'. What is the molecular formula of sulfur under these conditions? 1.8(b) At 100°C and 1.60 kPa, the mass density of phosphorus vapour is 0.6388 kg m-'. What is the molecular formula of phosphorus under these conditions?

a) You wish to melt a 3.0-kg block of aluminum, which has already been heated to...

a) You wish to melt a 3.0-kg block of aluminum, which has already been heated to 660ºC. How much heat is required to melt the aluminum? (the textbook lists the latent heat of aluminum as 396,000 J/kg) b) You wish to melt a 3.0-kg block of aluminum, which initially at 20ºC. How much heat is required to melt the aluminum? (the textbook lists the latent heat of aluminum as 396,000 J/kg)

Question