Question

A rigid closed tank is full of oxygen at 120 kPa and 25 C. The mass of oxygen in the tank is 1.8 kg. A stirring device introduces 150 kJ of work and there is heat loss to the surroundings in the amount of 45 kJ. Find the final temperature in Celsius and pressure in kPa. Assume specific heats constant at room temperature (300 K).

Answer #1

A rigid closed tank is full of oxygen at 120 kPa and 25 C. The
mass of oxygen in the tank is 1.8
kg. A stirring device introduces 150 kJ of work and there is heat
loss to the surroundings in the
amount of 45 kJ. Find the final temperature in Celsius and pressure
in kPa.
Assume specific heats constant at room temperature (300 K).

Water of mass 2 kg in a closed, rigid tank is initially in the
form of a twophase liquid-vapor mixture. The initial temperature is
50° C. The mixture is heated until the tank contains only saturated
vapor at 110° C.
(i) Find the initial pressure, in kPa.
(ii) Find the work for the process, in kJ.
(iii) Find the heat transfer for the process, in kJ.

A closed, rigid tank is filled with a gas modeled as an ideal
gas, initially at 80°C and a gage pressure of 300 kPa. The gas is
heated, and the gage pressure at the final state is 500 kPa. The
local atmospheric pressure is 1 atm.
Determine the final temperature, in °C.

Air in a rigid tank is at 140 kPa, 300 K with a volume of 0.6
m3. The tank is heated to 400 K. Now one side of the
tank acts as a piston letting the air expand slowly at constant
temperature process to state 3 with a volume of 1.4 m3.
The total heat transfer is.

(10 pts) A 10 m3 rigid storage tank contains oxygen
gas (R = 0.2598 kJ/kg.K, cp = 0.918 kJ/kg.K,
cv = 0.658 kJ/kg.K). The tank is initially 200 kPa and
600o It is cooled to 25oC in 35 minutes.
Determine:
(3 pts) The mass of oxygen in the tank, in kg.
(3 pts) The final pressure in the tank, in kPa.
(4 pts) The rate of heat transfer from the oxygen, in kW.

A 0.1-m3 rigid tank contains saturated liquid-vapor mixture of
water, initially at 150 kPa and 52 percent quality. Heat is now
transferred to the tank until the system becomes superheated vapor
and the pressure reaches 300 kPa. Determine (a) the total mass of
the mixture in the tank and (b) the amount of heat transferred.

Air is contained in a rigid, well-insulated container
of volume 3 m3. The air undergoes a process from
an initial state with a pressure of 200 kPa and temperature of 300
K. During the process, the air
receives 720 kJ of work from a paddle wheel. Model the air as an
ideal gas with constant specific
heats. Evaluate the specific heats at 300 K. Neglect changes in
kinetic energy and potential energy.
Determine the mass of the air in kg,...

An initially empty, well insulated, rigid tank with a volume of
2 m3 is fitted with a mixing device. The tank has two inlets and
zero outlets. One inlet is water at 1 MPa and 600◦C while the other
is saturated liquid water. Both enter the tank slowly. If the
amount of work done by the mixing device is 300 kJ, what must the
temperature of the saturated liquid water be if the same mass is
added through both inlets...

A 50 kg copper block initially at 350 oC is quenched in a
closed, rigid insulated tank containing 120 L of liquid water at 25
oC. Specific heat of copper, Cc = 385 J/(kgK), specific heat of
liquid water, Cw = 4180J/(kgK). (i) Calculate the entropy change
(kJ/K) of copper block. (ii) Determine the entropy change (kJ/K) of
liquid water.

An adiabatic air compressor compresses 10.6 L/s of air at 120
kPa and 20°C to 1000 kPa and 300°C. The constant pressure specific
heat of air at the average temperature of 160°C = 433 K is
cP = 1.018 kJ/kg·K. The gas constant of air is
R = 0.287 kPa·m3/kg·K. Determine the work
required by the compressor

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