Quiz 22

1. Which of the following is a correct statement?

A. Total internal energy of a system is not a state function.
B. Pressure of a system is not a state function.
C. Work done on a system is a state function.
D. Temperature of a system is not a state function.
E. Heat supplied to a system is not a state function.

2. Heat supplied to a system is not a state function.

A. 65 J
B. -125 J
C. -65 J
D. 125 J
E. 0 J

3. The internal energy of a system of gas increased by 300 J while losing 350 J of heat energy. Calculate the work done by (on) the system.

A. 650 J
B. 0 J
C. -650 J
D. -50 J
E. 50 J

4. The volume of a system of gas decreased from 55 L to 40 L under a pressure of 30 kPa while gaining 605 J of internal energy. Calculate the amount of supplied or lost.

A. -155 J
B. 0 J
C. 1055 J
D. 155 J
E. -1055 J

5. In a cyclic process, a system of gas lost 100 J of heat energy. Which of the following is a correct statement.

A. The change in internal energy or the work done can not be determined based on the given information.
B. The internal energy of the system increased by 100 J.
C. The internal energy of the system decreased by 100 J.
D. 100 J of work was done by the enviornment on the system
E. The work done by (on) the sytem is zero.

6. The following is a PV dagram for a certain system of gas.

Calculate the work done in taking the system from the point C( 6 L, 4 kPa) to the point A( 2 L, 2 kPa) along path CDA.

A. 16 J
B. 8 J
C. 24 J
D. -16 J
E. -8 J

7. The following is a PV dagram for a certain system of gas.

Calculate the heat supplied (lost) in taking the system from the point C( 6 L, 4 kPa) where its internal energy is 70 J to the point A( 2 L, 2 kPa), where its internal energy is 55 J, along path CDA.

A. -31 J
B. -7 J
C. 1 J
D. -23 J
E. -39 J

8. The following is a PV dagram for a certain system of gas.

Calculate the work done by (on) the system for the cyclic process ABCDA.

A. 0 J
B. 16 J
C. 8 J
D. -16 J
E. -8 J

9. The following is a PV dagram for a certain system of gas.

Calculate the heat supplied to (lost by) the system for the cyclic process ABCDA.

A. 16 J
B. 8 J
C. -16 J
D. -8 J
E. 0 J

10. The absolute tendency of nature is

A. to lower its enthalpy
B. to increase its Gibb's function (free energy)
C. to increase its entropy
D. to increase its enthalpy.
E. to lower its Gibb's function (free energy)

11. A heat engine absorbs 1611 J of energy from a hot reservior at a temperature of 320 °C and gives off 749 J of energy to a cold reservior at a temperature of 32 °C in a cyclic process. Calculate the efficiency of the engine.

A. 101.299%
B. 79.564%
C. 53.507%
D. 91.773%
E. 10.807%

12. Calculate the change in entropy during the vaporization of 0.2 kg of water.(Latent heat of vaporization for water is 2.26e6 J ⁄ kg).

A. 2272.229 J ⁄ °K
B. 1211.796 J ⁄ °K
C. 819.309 J ⁄ °K
D. 2148.48 J ⁄ °K
E. 1733.179 J ⁄ °K

Quiz 22: