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Chemical Engineering Practice Test: Energy Balances for Processes without Reaction and Calculation of Enthalpy Changes
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Topics in this quiz include: Potential energy, kinetic energy, internal energy and their conversion concepts, energy balances for open, closed, steady and unsteady state systems, phase transitions and heat capacity equations.

Chemical Engineering Practice Test: Energy Balances for Processes without Reaction and Calculation of Enthalpy Changes
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25 Questions

1. Ratio of change in internal energy of a substance from 15oC to T and from T to 10oC is – 2, what is T?
2. 150 J is the latent heat for vaporization of water, what is the heat of transition from 50oC water to 100oC steam if heat of transition from 50oC water to 100oC water is 12 J?
3. Which of the following is heat required in phase transitions?
4. For an open unsteady state system, 15 J of heat was supplied and -5 J of work was done on the system, what is the value of a change in enthalpy?
5. For an open unsteady state system, 5 J of heat was supplied and 10 J of work was done on the system, what is the value of a change in enthalpy?
6. CP-T curve of H2 forms a rectangle of height 20 J/oC from 4oC to 5oC?
7. 15 J of heat is supplied to a system and system does 5 J of work, what is the change in internal energy?
8. 2 Kg of steam is enclosed in a container with internal energy = 5 J/Kg, then 5 J of heat is supplied to the system, what is the final internal energy?
9. Which of the following represents vaporization?
10. CP-T curve covers 10 J from 2oC to 10oC, what is the enthalpy change?
11. 10 J of work is done on a steady state system, what is the heat supplied to the system?
12. What is the change in potential energy of a stone of mass 1 Kg thrown up with a velocity 10 m/s and comes down?
13. If Cp of liquid benzene is 15 J/oC, what is the enthalpy change of water from 5oC to 10oC?
14. What is the latent heat for melting?
15. Cyclohexane having CP = 48 J/oC, is heated from 50oC to 55oC, what is the enthalpy change?
16. If Cp of solid benzene is 10 J/oC, what is the enthalpy change of water from 5oC to 75oC?
17. Cp of ice is 10 J/oC and that of water is 15 J/oC, what is the enthalpy change of water from – 15oC to 0oC at standard conditions, if the later heat of fusion of water is 110 J?
18. What is the change in internal energy of 1 mole of air ((Cv = 2.1 X 104 J/moleoC), if its temperature changes from 10oC to 5oC?
19. Vaporization starts at which point?
20. A stone is released from a cliff and comes down, what is the change in kinetic energy of stone?
21. For an open unsteady state system, 5 J of heat was supplied and 10 J of work was done by the system, what is the value of a change in enthalpy?
22. A mixture contains 20% SO2 with CP= 35 J/oC, 30% NO3 with CP = 20 J/oC and 50% CO2 with CP = 40 J/oC, what is the average CP of mixture?
23. What is the change in internal energy of 2 mole of air (Cv = 2.1 X 104 J/moleoC), if its temperature changes from 10oC to 20oC?
24. A stone has initial potential and kinetic energy as 5 J and 20 J respectively if the final kinetic energy of the stone is 15 J what is its final potential energy?
25. Liquid benzene having CP = 29 J/oC, is heated from 5oC to 10oC, what is the enthalpy change?

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