Thermodynamics and Energy Changes (5E)
MCAT · Flashcards · Application
MCAT · FLASHCARDS
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QUESTION
Find
Δ
G
\Delta G
Δ
G
at
T
=
300
K
T=300\,\text{K}
T
=
300
K
if
Δ
H
=
20
kJ
\Delta H=20\,\text{kJ}
Δ
H
=
20
kJ
and
Δ
S
=
50
J⋅K
−
1
\Delta S=50\,\text{J·K}^{-1}
Δ
S
=
50
J⋅K
−
1
.
QUESTION
Find
q
p
q_p
q
p
if
n
=
2
n=2
n
=
2
and
C
p
=
30
J⋅mol
−
1
⋅K
−
1
C_p=30\,\text{J·mol}^{-1}\text{·K}^{-1}
C
p
=
30
J⋅mol
−
1
⋅K
−
1
for
Δ
T
=
10
K
\Delta T=10\,\text{K}
Δ
T
=
10
K
.
QUESTION
Find
Δ
U
\Delta U
Δ
U
if
q
=
−
50
J
q=-50\,\text{J}
q
=
−
50
J
and
w
=
+
20
J
w=+20\,\text{J}
w
=
+
20
J
for the system.
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ANSWER
Δ
U
=
−
30
J
\Delta U=-30\,\text{J}
Δ
U
=
−
30
J
. The first law calculates internal energy change as the sum of heat and work with proper signs.
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