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One mole of an ideal gas
CP=7R2 in a closed
piston/cylinder arrangement is compressed from
Ti=200 K , Pi=0.5
MPa to Pf=5 MPa by following
paths:.
ADIABATIC path
ISOTHERMAL path
Calculate ΔU, ΔH, Q and WEC for both paths.
NOTE: Keep the answers in terms of ‘R’.
stion here
One mole of an ideal gas (CP/R=7/2), is
compressed in a steady-flow compressor from 2.5 bar and 25°C to 6.5
bar and 120°C. The compressor rejects 0.5 kJ as heat to the
surrounding at 293K.
Calculate:
1. The enthalpy
change of the gas (in kJ)
2. The entropy
change of the gas (in J.mol-1)
3. The work
required for the compression (in kJ)
4. The ideal work
of the process (in kJ)
5. The
thermodynamic efficiency
The lost work (in kJ)
Consider a process in which one mole of
a monatomic ideal gas is compressed from
a volume of V1 =1.459m3 to V2 =1m3 at a
constant temperature of T =353.7 K.
(a) What is the entropy change of the gas (in
J/K units)?
(b) What is the change in the value of PV for
the gas (in J units)?
(c) What is the energy change of the gas (in J
units)?
(d) What is the enthalpy change of the gas...
One kg mole of an ideal gas is compressed isothermally at 127°C
from 1 atm to 10 atm in a piston-and-cylinder arrangement.
Calculate the entropy change of the gas, the entropy change of the
surroundings, and the total energy change resulting from the
process, if: (a) the process is mechanically reversible and the
surroundings consist of a heat reservoir at 127°C. (b) the process
is mechanically reversible and the surroundings consist of a heat
reservoir at 27°C. (c) the process...
A cylinder containing ideal gas is sealed by a piston that is
above the gas. The piston is a cylindrical object, with a weight of
36.0 N, which can slide up or down in the cylinder without
friction. The inner radius of the cylinder, and the radius of the
piston, is 7.00 cm. The top of the piston is exposed to the
atmosphere, and the atmospheric pressure is 101.3 kPa. The cylinder
has a height of 30.0 cm, and, when...
Constant amount of ideal gas is kept inside a cylinder by a
piston. The piston is locked in to position, it is not allowed to
move. The gas is then heated up. Compare the initial (i) and the
final (f) physical quantities of the gas to each other.
(The fill in the blank options are greater than, less than, or
equal too).
The volume Vf is ... Vi.
The temperature Tf is ... Ti.
The internal energy Uf is ......
One mole of an ideal gas at 1.00 atm and 298K with
Cp,m=3.5R is put through the
following cycle: a) (reversible) constant volume heating to
twice its initial
temperature; b) reversible, adiabatic expansion back to its
initial temperature;
c) reversible isothermal compression back to 1.00 atm. Calculate
ΔS for each step and
overall. d) What is the change of entropy of the
surroundings?
The drawing shows an ideal gas confined to a cylinder by a
massless piston that is attached to an ideal spring. Outside the
cylinder is a vacuum. The cross-sectional area of the piston is
A = 2.50 × 10-3 m2. The initial
pressure, volume, and temperature of the gas are, respectively,
P0, V0 = 6.00 ×
10-4 m3 and T0 = 273 K,
and the spring is initially stretched by an amount
x0 = 0.090 m with respect to its...
The drawing shows an ideal gas confined to a cylinder by a
massless piston that is attached to an ideal spring. Outside the
cylinder is a vacuum. The cross-sectional area of the piston is A =
2.50 × 10-3 m2. The initial pressure, volume, and temperature of
the gas are, respectively, P0, V0 = 6.00 × 10-4 m3 and T0 = 273 K,
and the spring is initially stretched by an amount x0 = 0.092 m
with respect to its...