Question

7. (15 pts.) A cylinder contains 4 mol of an ideal gas at 30oC. If it expands from an initial volume of 1.0 m3 to 2.0 m3 while maintained at a constant pressure of 200 kPa (a) What is the change in the temperature of the gas? (b) How much heat is absorbed or released from the system, over the process? The pressure is then reduced while the gas is held at a constant volume. (c) If over this process the gas is returned to its original temperature, what is the heat absorbed or released, over that process?

Answer #1

negative sign shows that heat is leaving the gas.

With the pressure held constant at 250 kPa , 47 mol of a
monatomic ideal gas expands from an initial volume of 0.70 m3 to a
final volume of 1.9 m3 .
a) How much work was done by the gas during the expansion?
b) What were the initial temperature of the gas?
c) What were the final temperature of the gas?
d) What was the change in the internal energy of the gas?
e) How much heat was added...

A 0.505-mol sample of an ideal diatomic gas at 408 kPa and 309 K
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Find the final temperature and volume of the gas, the work done by
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following.
(a) isothermal
final temperature K
volume of the gas
L
work done by the gas
J
heat absorbed
J
(b) adiabatic
final temperature K
volume of the gas L...

A cylinder sealed with a piston contains an ideal gas. Heat is
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1. The pressure of the gas a. doubles b. stays the same c. drops
in half
2. The work done by the surroundings on the gas is a. positive
b. negative c. zero
3. The thermal energy of the gas a. doubles b. stays the same c.
drops in...

A cylinder containing an ideal gas has a volume of 2.6 m3 and a
pressure of 1.5× 105 Pa at a temperature of 300 K. The cylinder is
placed against a metal block that is maintained at 900 K and the
gas expands as the pressure remains constant until the temperature
of the gas reaches 900 K. The change in internal energy of the gas
is +6.0× 105 J. How much heat did the gas absorb?
a. 1.4E+6 J
b....

A piston-cylinder assembly containing 3 kg of an ideal gas
undergoes a constant pressure process from an initial volume of 48
m3 to a final volume of 30 m3 . During the
process, the piston supplies 1.2 MJ of work to the gas. The gas has
a constant specific heat at constant volume of 1.80 kJ/(kg∙K) and a
specific gas constant of 1.48 kJ/(kg∙K). Neglect potential and
kinetic energy changes.
a. Determine the initial specific volume of the gas in...

A 2.0 mol sample of ideal gas with molar specific heat
Cv = (5/2)R is initially at 300 K and 100 kPa pressure. Determine
the final temperature and the work done on the gas when 1.6 kJ of
heat is added to the gas during each of these separate processes
(all starting at same initial temperature and pressure: (a)
isothermal (constant temperature) process, (b) isometric (constant
volume) process, and (c) isobaric (constant pressure) process.
Hint: You’ll need the 1st Law...

Oxygen gas is contained in a piston cylinder assembly at an
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A cylinder contains 1.5 moles of ideal gas, initially at a
temperature of 113 ∘C. The cylinder is provided with a frictionless
piston, which maintains a constant pressure of 6.4×105Pa on the
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For the gas CV = 11.65 J/mol⋅K, and the ideal gas
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A cylinder of volume 0.320 m3 contains 11.1 mol of
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Pa
(b) Find the internal energy of the gas.
J
(c) Suppose the gas expands at constant pressure to a volume of
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J
(d) What is the temperature of the gas at the new volume?
K
(e) Find the internal energy...

A cylinder of monatomic ideal gas is sealed in a cylinder by a
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is then done on the piston, compressing the gas (in other words,
the gas does −65.0 J of work). The work is done very slowly so that
the gas maintains a...

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