Physics2 Final Exam Chapter 4 Chapter 5 Ideal gas Kinetic theory of gases Molar specific heats of an ideal gas State converting of an ideal gas Heat and first law of thermodynamics Change in entropy S.
Trang 1Physics2 Final Exam
Chapter 4
Chapter 5
Ideal gas
Kinetic theory of gases
Molar specific heats of an ideal gas
State converting of an ideal gas
Heat and first law of thermodynamics
Change in entropy Second law of thermodynamics
Entropy in ideal gas
Entropy in liquid and solid
PV = nRT = NkT
nR = Nk With N = n.Na(Avodgadro) Where :
k = 1.38 x 10^-23
NA = 6.02 x 10^23
R = 0.082 when P (atm) ; V(dm^3 = liter)
R = 8.314 (Usually used) when P(Pa) ; V (m^3)
T : C + 273.15 (K)
The mean free path for a gas molecule
Root- mean – square speed
Average speed
Most probable speed
The mean free time
Average translational kinetic energy
Distance between two molecules or atoms With d : diameter (m)
Monatomic gas > f = 3 Diatomic gas > f = 5 Polyatomic gas > f = 7 Isochoric ( V constant) Isobaric ( P constant)
V P=nR T
p V=nR T
For a particular process (pV)=nR T
Pf.Vf – Pi.Vi = nR T
Isochoric ( V constant)
Isobaric ( P constant)
Isothermal ( T constant)
Adiabatic ( Q = 0 )
Eint=Q-W=nCv T (J) Heat : Q = nC T (J)
Cv or Cp
Cv = f/2*R
Cp = (f+2)/2 * R
S=mc(lnT2-T1)
S≥0
Isochoric ( V constant)
Isobaric ( P constant)
Isothermal ( T constant) Adiabatic(Q=0) S=0
Cooling or heating
Phase change
Unchanging T-process
Q = mc T When phase change : Q = Lm