Question
In: Chemistry
A system initially contains 2 lb of liquid water at 110ºF and 0.4 lb of ice...
A system initially contains 2 lb of liquid water at 110ºF and 0.4 lb of ice at 32 ºF. The system attains an equilibrium state, while pressure remains constant at 1 atm. For water, the specific enthalpy change for a phase change from solid to liquid at 1 atm is 144 Btu/lb. If heat transfer with the surroundings is negligible, determine
(a) the final temperature, in ºF
(b) the amount of entropy produced in the process, in Btu/ºR.
Solutions
queen_honey_blossom answered 1 year agoRelated Solutions
A vessel initially contains 5.0 kg of liquid water and 2.0 kg of ice at 0...
A vessel initially contains 5.0 kg of liquid water and 2.0 kg of
ice at 0 C. Energy is added until the ice has just melted. The
temperature at the boundary where heat transfer occurs is taken to
be the system temperature during the process. The enthalpy of
melting ice is 333.5 kJ/kg. Consider the following processes used
to melt the ice.
a.) Heat is added to from the environment at 20 C. Determine the
entropy flux and the total...
A piston–cylinder assembly contains 2 lb of water, initially at 100 lbf/in.2 and 600°F. The water...
A piston–cylinder assembly contains 2 lb of water, initially at
100 lbf/in.2 and 600°F. The water undergoes two processes in
series: a constant-pressure process followed by a constant volume
process. At the end of the constant-volume process, the temperature
is 300°F and the water is a two-phase liquid–vapor mixture with a
quality of 50%. Neglect kinetic and potential energy effects.
Determine the work and heat transfer for each process, all in
Btu.
Problem 3.034 A closed, rigid tank is filled with water. Initially, the tank holds 0.4 lb...
Problem 3.034
A closed, rigid tank is filled with water. Initially, the tank
holds 0.4 lb of saturated vapor and 4.0 lb of saturated liquid,
each at 212°F. The water is heated until the tank contains only
saturated vapor. Kinetic and potential energy effects can be
ignored.
Determine the volume of the tank, in ft3, the
temperature at the final state, in °F, and the heat transfer, in
Btu.
A closed, rigid tank contains water initially at 250 °F with a quality of 0.4. The...
A closed, rigid tank contains water initially at 250 °F with a
quality of 0.4. The tank is heated until the water reaches 290 °F.
Find the initial and final pressure, in lbf/in2 . Sketch the
process on P-υ and T-υ diagrams (be sure to include the vapor dome,
constant temperature and pressure lines, number your states, and
indicate the process direction with an arrow). Thermodynamic
An adiabatic tank contains 120 kg of liquid water initially at 70 °C. The water within...
An adiabatic tank contains 120 kg of liquid
water initially at 70 °C. The
water within the tank is utilized to quench (cool) a
15 kg steel block initially at
300 °C. The steel block is dropped into the tank,
and after some time the steel block and the water in the tank reach
thermal equilibrium.
Determine the total entropy change during the
quenching process.
Specific heat of steel : Csteel=
0.50 kJ/kg*K.
Specific heat of water : Cwater=
4.18...
A rigid 10-L vessel initially contains a mixture of liquid water and vapor at 100C with...
A rigid 10-L vessel initially contains a mixture of liquid water
and vapor at 100C with 12.3 percent quality. The mixture is then
heated until its temperature is 180C. Calculate the heat transfer
required for this process.
A tank originally contains 100 gal of fresh water. Then water containing 1 2 lb of...
A tank originally contains 100 gal of fresh water. Then water
containing 1 2 lb of salt per gallon is poured into the tank at a
rate of 2 gal/min, and the mixture is allowed to leave at the same
rate. After 10 min the process is stopped, and fresh water is
poured into the tank at a rate of 4 gal/min, with the mixture again
leaving at the same rate. Find the amount of salt in the tank at...
A tank originally contains 100 gal of fresh water. Then water containing 1 2 lb of...
A tank originally contains 100 gal of fresh water. Then water
containing
1
2
lb of salt per gallon is poured into the tank at a rate of 2
gal/min, and the mixture is allowed to leave at the same rate.
After 10 min the process is stopped, and fresh water is poured into
the tank at a rate of
6 gal/min,
with the mixture again leaving at the same rate. Find the amount
of salt in the tank at...
A piston–cylinder device initially contains 2 kg water in 1 m3 at 500 kPa. The system...
A piston–cylinder device initially contains 2 kg water in 1 m3
at 500 kPa. The system then cools down and the volume drops to half
and pressure of 300 kPa. At this state, the piston is resting on a
set of stops, and the mass of the piston is such that a pressure of
500 kPa is required to move it. (a) Show the process on a P-v, T-v
and P-T diagrams with respect to saturation lines and determine,
(b)...
2 kg of water exist initially as a vapor and liquid at 90 degrees C in...
2 kg of water exist initially as a vapor and liquid at 90
degrees C in a rigid container of volume 2.42 m^3 (a) at what
pressure is the system? (b) what is the quality of the system (c)
the temperature of the container is raised to 100 degrees C. what
is the quality of the system and what is the pressure? what are the
dH and dU at this point relative to the initial state? (d) as the
temperature...
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