Question

A frictionless piston-cylinder device and a rigid tank contain 3.3 kg of neon gas at the same temperature, pressure and volume. Now heat is transferred, and the temperature of both systems is increased by 10 degrees C. The amount of extra heat that must be supplied to neon gas in the cylinder that is maintained at constant pressure is ...

Answer #1

A piston cylinder device contains a mixture of 0.2 kg of H2 and
1.6 kg of N2 at 100 kPa and 300K. Heat is now transferred to the
mixture at constant pressure unitl the volume is doubled. Assuming
constant specific heats at the average temperature (the constant
pressure specific heats of H2 and N2 are 14.501 kJ/kg°K and 1.049
kJ/kg°K, respectively), determine: a) the heat transfer. b) the
entropy change of the mixture.

A gas is enclosed in a cylinder fitted with a light frictionless
piston and maintained at atmospheric pressure. When 254 kcal of
heat is added to the gas, the volume is observed to increase slowly
from 12.0 m3 to 16.2 m3 .
A. Calculate the work done by the gas
B. Calculate the change in internal energy of the gas.

H3.3 A frictionless piston-cylinder device contains 2 kg of H2O
initially at T1 = 300◦C and p1 = 5 bar. The device is cooled at
constant pressure until the volume is ∀2 = 0.5 m3 . Assume a
quasiequillibrium process which occurs slowly with no acceleration
as the piston moves. Kinetic and potential energy effects are
negligible. Determine: a. work [kJ] during process (indicate
magnitude and direction) b. heat transfer [kJ] during process
(indicate magnitude and direction)

The volume of 0.850 kg of argon (MW = 40) in a closed
piston-cylinder device is initially 0.500 m3. Now the gas is
expanded at a constant pressure of 165.0 kPa to a volume of 1.30
m3. Note: The IUPAC sign convention for work is used. Work into the
system has a positive value. What is the moving boundary work? kJ
What is the heat interaction? Assume Cp(T)= 21 kJ/kmol·K. kJ

One mole of ethylene at 1 bar and 25C is placed inside a
frictionless piston-cylinder device. The gas is then subjected to a
two-step process: (1) by keeping the piston fixed with a lacking
mechanism, 25KJ of heat is added via an electrical heater; and
(2)the locking mechanism is then released and 15KJ of heat is
removed. The second step of the process takes placed at constant
pressure. Assuming ethylene is an ideal gas, determine the
following:
(a) The temperature...

A piston-cylinder device contains 0.54 kg of steam at 300
degrees C and 3 MPa. Steam is cooled at constant pressure until
one-half of the mass condenses. (A) Find the final temperature (B)
Determine the volume change

1) An ideal gas is contained in a
piston-cylinder device and undergoes a power cycle as follows:
1-2 isentropic compression from an initial
temperatureT1= 20 degree celsius with a compression ratio
r = 5
2-3 constant pressure heat addition 3-1 constant volume heat
rejection
The gas has constant specific heats with cv = 0.7
kJ/kg·K and R= 0.3 kJ/kg·K.
(a) Sketch the
P-v and T-s diagrams for the cycle.
(b) Determine the heat
and work interactions for each pro-cess, in...

1-kg water in a frictionless piston-cylinder device is initially
at 250°C and 300 kPa (state
1). A total of 700 kJ of work is done ON the water
in order to isothermally reduce its volume to
1/20 of its initial volume (state 2). Determine the magnitude and
direction of the heat transfer
involved in this process.
Answer: -1147 kJ.

A closed piston-cylinder system contains a 120
moles of neon, a monatomic ideal gas, at pressure
PA = 2.5 atm
and volume VA = 0.80
m3. It undergoes the following cyclic
process:
A -> B: I
There is isothermal expansion to volume double of the original.
B -> C:
Constant-volume process back to its original pressure .
C -> A:
Constant-pressure process back to its initial state
a) Draw a Pressure volume diagram for the cycle. You
don't need to...

A piston-cylinder contains 2 kg of refrigerant R-134a at
temperature -20 degrees Celsius and a quality of 20% is heated in
device until it reaches a saturated mixture with quality 60%. a)
Show process on a P-v and P-T diagram b) What is the pressure? c)
What is the change in volume? d) What is the change in the internal
energy? e) Redo the problem if the piston-cylinder assembly is
replaced with a rigid container.

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