Question

Calculate the work done on and by the system and surroundings in an isothermal gas expansion at 300K from 10L to 15L for 2 moles of helium. Determine the transfer of heat to and from the system and surroundings as well. (4 values total)

Answer #1

In a gas expansion, 81 J of heat is absorbed from the
surroundings, and the energy of the system decreases by 116 J.
Calculate the work done.

Derive the expression for work done by expanding a van der
Waal's system. Express the relationship:
a) in terms of volume
b) in terms of pressure
c) Calculate the work done by isothermal expansion of a van der
Waals gas from 1 L to 2 L, and compare the result to the work done
in an ideal system. Comment on why the values are different.

Show that the work done by an ideal gas during an isothermal
change of state (from initial state 1 to final state 2), in a
closed container is given by; 1W2=m.R.T(ln(v2/v1))
A piston-cylinder device contains 0.2 kg of air, initially at
27oC and 100 kPa. The air is then slowly compressed in an
isothermal process to a final pressure of 400 kPa.
Determine: (a) The work done during this process, and
(b) The heat transferred.

Calculate the total expansion work done by 1.00 mol ideal gas in
a process that follows the path (1>2>3>4>5>6) as
indicated in the following diagram.
Top Figure: What is the temperate of the gas at the isothermal
curve in the diagram?
Bottom Figure: The cartoon below represents an experimental
setup for conducting the process in the diagram above. What would
you have to do to achieve step 1>2 if the cartoon shows the
conditions at 1?
Chegg won't let me...

7. 1.55 moles of Argon gas undergo an isothermal reversible
expansion from an initial volume of 5.00 L to 105. L at 300 K.
Calculate the work done during this process using: (a) the ideal
gas equation, and (b) the van der Waals equation of state. Van der
Waals parameters for Ar are available in the back of the book.
Compare the two results, what percentage of the work done by the
van der Waals gas arises due to having...

Complete each of the statements below.
When work is done on a system by its surroundings, the sign of w
is
[ Select ]
["positive", "negative"]
.
When work is done by a system on its surroundings, the sign of w
is
[ Select ]
["negative", "positive"]
...

Enthopy
1) A system gains heat from the surroundings and has work done
on it by the surroundings. What are the signs of qsystem and
wsystem?
Answers:
qsystem<0 and wsystem>0
qsystem>0 and wsystem>0
qsystem>0 and wsystem<0
qsystem<0 and wsystem<0
2) Acetylene (C2H2) is used in welding torches. How much heat is
produced if 6.55gC2H2 is combusted with excess oxygen gas?
C2H2(g)+52O2(g)⟶2CO2(g)+H2O(l)ΔH∘c=−1301.1kJ/mol
Answers
−327kJ
−8520kJ
−0.131kJ
−419kJ

(a) During an isothermal process, 5.00 J of heat is removed from
an ideal gas. Determine the work done in the process and the
internal energy change. (b) If the 300 J of work is done in
compressing a gas adiabatically, determine the change in internal
energy of the gas and amount of heat removed. (c) In an isochoric
process, the internal energy of a system decreases by 50.0 J.
Determine the work done in the process and the amount...

Suppose 4.00 mol of an ideal gas undergoes a reversible
isothermal expansion from volume V1 to volume V2 = 8V1 at
temperature T = 300 K. Find (a) the work done by the gas and (b)
the entropy change of the gas. (c) If the expansion is reversible
and adiabatic instead of isothermal, what is the entropy change of
the gas?

A Carnot engine uses the expansion and compression of n moles of
argon gas, for which CV=(3/2)R. This engine operates
between temperatures TC and TH. During the
isothermal expansion a→b, the volume of the gas increases from
Va to Vb=2Va.
a)Calculate the work done during the isothermal expansion a→b.
Express your answer in terms of the variables n, TH, and
gas constant R.
b)Calculate the work Wbc done during the adiabatic
expansion b→c. Express your answer in terms of the...

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