QUESTION 1 (20 Marks)
If 1kg of nitrogen (N_(2)) and 2kg of CO, each at (1)/(b)ar and 25deg C, blend to form a gas mixture at the same conditions, the gases are assumed ideal:
(a) What is the total change in entropy as a result of the process? Discuss if the process is reversible or irreversible.
(8 Maks)
(b) What is the change in enthalpy?
(5 Maks)
(c) Use the Lewis & Randall rule and the provided fugacity coefficent charts, to estimate the fugacity of CO in an equimolar mixture of CO and N_(2) at -70deg C and 300atm.
(7 Maks)
QUESTION 2 (20 Marks)
One kilogram of water (V_(1))=(1003cm^(3)*kg^(-1)) in a piston/cylinder device at 25deg C and (1)/(b)ar is compressed in a mechanically reversible, isothermal process to 1500 bar. A satisfactory assumption is that V is constant at its arithmetic average value. Additional information:
eta =250 imes 10^(-6)K^(-1) and kappa =(45 imes (10^(-6))/(b)ar ^(()-1).
Determine the followings
(a) Delta S and Delta H
(12 Marks)
(b) Delta U,Q, and W
(8 Marks)
QUESTION 3 (20 Marks)
A mixture containing equimolar amounts of benzene (1), toluene (2) and ethylbenzene (3) is flashed at 110deg C and 90kPa. Assuming that the Raoult's law is appropriate to this system, calculate the followings:
(a) Molar fraction V of the vapours formed.
(10 Marks)
(b) Equilibrium mole fractions (x_(i),y_(i))
(10 Marks)
QUESTION 1 (20 Marks) If 1 kg of nitrogen (N) and 2 kg of CO, each at 1 bar and 25C, blend to form a gas mixture at the same conditions, the gases are assumed ideal:
(a) What is the total change in entropy as a result of the process? Discuss if the process is
reversible or irreversible.
(8 Maks)
(b) What is the change in enthalpy?
(5 Maks)
c Use the Lewis & Randall rule and the provided fugacity coefficent charts,to estimate
the fugacity of CO in an equimolar mixture of CO and N2 at -70 C and 300 atm. (7 Maks)
QUESTION 2 (20 Marks)
One kilogram of water (V = 1003 cm3kg in a piston/cylinder device at 25 C and 1 bar is
compressed in a mechanically reversible, isothermal process to 1500 bar. A satisfactory
assumption is that V is constant at its arithmetic average value. Additional information:
=250 10-6K- and =45 10- bar-1
Determine the followings
(a) S and H
(12 Marks)
(b) U, Q, and W
(8 Marks)
QUESTION 3 (20 Marks)
A mixture containing equimolar amounts of benzene (1), toluene (2) and ethylbenzene (3) is flashed at 110 C and 90 kPa. Assuming that the Raoult's law is appropriate to this system, calculate the followings: (a) Molar fraction Vof the vapours formed. (10 Marks) (b) Equilibrium mole fractions (xi, yi) (10 Marks)