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Chem 430 - Fall 2001 - Test 1 - September 27, 2001
Name
SS#
(Unless otherwise stated assume gas to be acting ideal)
( 5) 1.
What is the mole fraction of Argon in air if the
atmospheric pressure is 746.2 torr? Assume that air is
made up of the following gasses with partial pressures in
parenthesis. Nitrogen (595.4 torr); oxygen (141.8 torr)
and argon (9.0 torr).
( 2) 2.
A system where mass and energy are conserved is called a
system.
( 2) 3.
All state variables can only be determined relatively ()
except one, which one is it?
( 4) 4.
What does the 2rd Law of thermodynamics state?
Chem 430 - Fall 2001 - Test 1 - Page 2
( 4) 5.
Give the expression for the (H/P)T for a real gas and
define the symbols?
(26) 6.
What is the heat (q), work (w), change in internal energy
(U), change in enthalpy (H), change in entropy of the
system (SSYS), change in entropy of the surroundings
(SSURR), and change in entropy of the universe (SUNIV)
for the process of compressing 2.00 mole of an ideal
monatomic gas from 3.00 x 10-3 m3 at 360.2 K to 1.00 x 103 m3 adiabatically by a constant pressure of 1.00 MPa?
Chem 430 - Fall 2001 - Test 1 - Page 3
( 8) 7.
When a 0.8510 g sample of benzoic acid (C7H6O2) at 298.15
K is combusted with excess O2 in a bomb calorimeter, the
temperature rises 1.870 K. What is the molar internal
energy of combustion of propene is the heat capacity of
the calorimeter is 11768 J/K?
(10) 7.
What is the G, H, S of mixing 2.00 moles of Ar with
5.00 moles of Ne on at 200.0 K?
Chem 430 - Fall 2001 - Test 1 - Page 4
(16) 8.
What is the G and S of the following reaction at 338.15
K and 100.0 bar if the Go298.15 and Ho298.15 are –53.00kJ
and -160.58 kJ respectively?
N2(g)
( 7) 9.
+ 3 H2(g)

2 NH3(g)
What is the enthalpy of combustion for cyclohexane given
the following heats of formation?
C6H12(l), Hfo=-156. kJ/mol;
kJ/mol
H2O(l), Hfo=-285.83 kJ/mol
CO2(g), Hfo=-393.51
Chem 430 - Fall 2001 - Test 1 - Page 5
( 2) 10. What is the SSYS for one cycle of a Carnot Engine?
(14) 11. What is the change in enthalpy and entropy on heating
1.00 mole of N2 from a liquid at 77.35K to a gas at 500.0
K at constant pressure given the following equation for
the temperature dependence of the molar heat capacity of
N2(g) and that the HVAP and Tb are 5.586 kJ/mol and
77.35K?
Cpo = 26.9835 + 0.0059622 T - 3.377 x 10-7 T2 (J K-1mol-1)