CHEM 305
1.
Solutions for assignment #2
The volume of some liquid varies with temperature according to V a bT cT 2 V where V is the
volume at 298 K and a, b, and c are empirically determined constants with the following values:
a 0.77
b 3.7 10 4 K 1
c 1.5

CHEM 305
1.
Solutions for assignment #4
A Carnot cycle heat engine does 2.50 J of work per cycle and has an efficiency of 45.0%. Find w, qH, and qC
for one cycle.
*Solution*
Since the engine does work on the surroundings it loses that amount of energy so

CHEM 305
1.
Solutions for assignment #3
From the following data, determine fH for diborane, B2H6(g) at 298 K:
1
2
3
B2H6 g 3O2 g B2O3s 3H2O g
r H 1941kJ mol-1
2Bs 23 O2 g B2O3s
r H 2368kJ mol-1
H2 g 21 O2 g H2O g
r H 241.8kJ mol-1
*Solution*
The reac

CHEM 305
1.
Solutions for assignment #1
Obtain the expression for the total differential dP for a van der Waals gas in terms of dT and dVm.
*Solution*
The van der Waals equation of state is:
P
RT
a
Vm b Vm2
Since we have P P Vm ,T , the total differentia

CHEM 305
1.
Assignment #4
A Carnot cycle heat engine does 2.50 J of work per cycle and has an efficiency of 45.0%. Find w, qH, and qC
for one cycle.
2. Heat pumps and refrigerators are heat engines running in reverse; a work input w causes the system to
a

CHEM 305
1.
Assignment #2
The volume of some liquid varies with temperature according to V a bT cT 2 V where V is the
volume at 298 K and a, b, and c are empirically determined constants with the following values:
a 0.77
b 3.7 10 4 K 1
c 1.52 10 6 K 2
Cal

CHEM 305
1.
Assignment #3
From the following data, determine fH for diborane, B2H6(g) at 298 K:
1
2
3
B2H6 g 3O2 g B2O3s 3H2O g
r H 1941kJ mol-1
2Bs 23 O2 g B2O3s
r H 2368kJ mol-1
H2 g 21 O2 g H2O g
r H 241.8kJ mol-1
2. Given that the standard enthal

CHEM 305
1.
Assignment #1
Obtain the expression for the total differential dP for a van der Waals gas in terms of dT and dVm.
2. Determine the thermal expansion coefficient for a gas that obeys the van der Waals equation of state.
(hint: try using the cyc

CHEM 305
1.
Assignment #5
Calculate G, A, and Suniv for each of the following processes and state any approximations made:
a. Reversible melting of 36.0 g of ice at 0C and 1 atm.
b. Reversible vaporization of 39 g of C6H6 at its normal boiling point of 80