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Byju's Answer
Standard XII
Physics
Principle of Superposition
In an isother...
Question
In an isothermal irreversible expansion of an ideal gas as per IUPAC sign convention:
A
Δ
U
=
0
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B
Δ
H
=
0
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C
w
=
−
n
R
T
ln
P
1
P
2
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D
w
=
−
q
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Solution
The correct options are
A
Δ
U
=
0
B
Δ
H
=
0
D
w
=
−
q
Suggest Corrections
0
Similar questions
Q.
Calculate
q
,
w
,
Δ
U
for the isothermal reversible expansion of 1 mole of an ideal gas from an initial pressure of
1.0
b
a
r
to a final pressure of
0.1
b
a
r
at a constant temperature of
273
K
.
Q.
Assertion (A):
Δ
U
=
0
for a reversible as well as irreversible expansion of an ideal gas under isothermal conditions, whereas
S
t
o
t
a
l
≠
0
for an irreversible process.
Reason (R) :
Δ
U
=
0
is independent of temperature whereas
S
is proportional to temperature.
Q.
In an isothermal expansion of a gaseous sample the correct relation is:
(consider w(work) with sign according to new IUPAC convention)
[The reversible and irreversible processes are carried out between same initial and final states]
Q.
Two mole of ideal diatomic gas
(
C
v
,
m
=
5
2
R
)
at 300 K and 5 atm expanded irreversly and adiabatically to a final pressure of 2 atm against a constant pressure of 1 atm. Calculate q, w,
Δ
H
and
Δ
U
.
Q.
Calculate
Q
,
w
,
Δ
U
,
Δ
H
for the isothermal reversible expansion of
1
mole of an ideal gas from an initial pressure of
1.0
bar to a final pressure of
0.1
bar at a constant temperature of
273
K
.
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