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7 Unsolved Questions Exam 1 - Physical Chemistry I | CH 720, Exams of Physical Chemistry

Material Type: Exam; Class: Physical Chemistry I; Subject: Chemistry; University: Emporia State University; Term: Fall 1999;

Typology: Exams

Pre 2010

Uploaded on 08/06/2009

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CH 720 Name:
EXAM #1
Fall 1999
1) A simplified version of the van der Waals equation takes into account only the
excluded volumes of the molecules and has the form:
P(V-nb) = nRT
Use this equation of state to derive an expression to calculate reversible
isothermal work. (15 points)
2) An ideal gas is reversibly and adiabatically compressed. The initial volume of the
system is three times the final volume of the system. The initial temperature of
the system was 83 C and Cp,m is 3.5R. Calculate q, w, Um, Hm. (20 points)
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CH 720 Name:

EXAM

Fall 1999

1) A simplified version of the van der Waals equation takes into account only the

excluded volumes of the molecules and has the form:

P(V-nb) = nRT

Use this equation of state to derive an expression to calculate reversible

isothermal work. (15 points)

2) An ideal gas is reversibly and adiabatically compressed. The initial volume of the

system is three times the final volume of the system. The initial temperature of

the system was 83 C and C p,m

is 3.5R. Calculate q, w, U m

, H

m

. (20 points)

3) A sample of liquid acetone (CH 3

2

CO weighing 0.700 g was burned in a bomb

calorimeter for which the heat capacity (including the sample) is 6937 J K

  • . The

observed temperature rise was from 23.45 C to 25.15 C. Calculate U

m

and H

m

(20 points)

4) The “skin” of a futuristic spy plane is made of a material that has an expansion

coefficient of 2.33 x 10

K

  • . When the plane is on the tarmac at 31.

0

C it leaks

fuel through 0.10 in gaps between the 1.0 ft x 1.0 ft x 0.50 in square plates of the

skin. To what temperature must the skin be raised to seal the leaks?(15 points)

7) One mole of a gas that obeys the equation of state in question 1) is compressed

isothermally from 12.5 L to 8.50 L at a temperature of 32.

0

C. Given that

and that b = 0.0552 L/mol calculate w, q, and U. (10 points)

V

U

T