Thermodynamics

Question 1

Extensive thermodynamic properties

Answer 1

G Gibbs Free energy
E(U) Internal energy
S Entropy
H Enthalpy
A Helmholtz energy
Conductance
Heat capacity

Question 2

State function

Answer 2

G
E
S
H
A
P PRESSURE
V VOLUME
T TEMPERATURE

Question 3

Isothermal process

Answer 3

dT=0
Temperature constant

Question 4

Isochoric process

Answer 4

Volume constant
dV=0

Question 5

Adiabatic process

Answer 5

Heat constant (q=constant)
dq=0

Question 6

Isobaric process

Answer 6

Pressure constant
dP=0

Question 7

Cyclic process

Answer 7

∆V=0
dV=0

Question 8

First Law of Thermodynamics

Answer 8

∆Internal energy=Heat+Work done
∆U=q+P∆V

Question 9

Work done in isothermal reversible process

Answer 9

Wrev=-2.303nRTlogP1/P2
=-2.303nRTlogV1/V2

Question 10

Sign convention for work

Answer 10

Work done by the system (expansion)=negative
Work done on the system (compression)=positive

Question 11

Internal energy in terms of Cv

Answer 11

dU=nCvdT

Question 12

Enthalpy change ∆H

Answer 12

∆H=∆U+∆PV

Question 13

Poison’s Relationship

Answer 13

Cp-Cv=R

Question 14

Atomicity ( γ)

Answer 14

γ=Cp/Cv

Question 15

Cp Cv and γ for monoatomic

Answer 15

Cp=5/2R
Cv=3/2R
γ=5/3=1.66

Question 16

Cp Cv & γ for diatomic

Answer 16

Cp=7/2R
Cv=5/2R
γ=7/5=1.4

Question 17

Cp Cv and γ for triatomic

Answer 17

Cp=4R
Cv=3R
γ=4/3=1.3

Question 18

Sign convention for heat

Answer 18

Heat absorbed by system=positive
Heat given out by system=negative

Question 19

Work done in Adiabatic reversible process

Answer 19

W=nR/γ-1(T1-T2)

Question 20

Work done in Isothermal irreversible process

Answer 20

W=nRT(1-P1/P2)

Question 21

Gibbs Free energy and spontaneity

Answer 21

∆G=∆H-T∆S

Question 22

Spontaneity table

Answer 22

∆H ∆S ∆T
+ + -
+ + +
- + -
- - -
- - +
+ - -