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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. 10 J of heat is taken off from a steady state system, what is the work done on the system?
2. What is the latent heat for melting?
3. A fluid is supplied to a cliff 20 m high and comes down by 5 m, what is the change in specific potential energy of fluid?
4. 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?
5. If Cp of steam is 105 J/oC, what is the enthalpy change of steam from 106oC to 118oC?
6. 15 J of heat is supplied to a system and system does 5 J of work, what is the change in internal energy?
7. 10 J of heat and 5 J of work are supplied to the system, what is the change in internal energy?
8. A mixture contains 20% O2 with CP = 10 J/oC, 30% N2 with CP = 20 J/oC and 50% CO2 with CP= 40 J/oC, what is the average CP of mixture?
9. A stone is thrown up with a velocity and comes down, what is the change in kinetic energy of stone?
10. Vaporization starts at which point?
11. 10 J of heat and 5 J of work is supplied to a system and 20 J of heat is taken out, then the system is which of the following?
12. Ice having CP = 15 J/oC, is heated from -10oC to -4oC, what is the enthalpy change?
13. 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?
14. 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?
15. 10 J of work and 5 J of heat is supplied to the system, then the system is which of the following?
16. Cp of ice is 25 J/oC and that of water is 30 J/oC, what is the enthalpy change of water from – 10oC to 35oC at standard conditions, if the later heat of fusion of water is 110 J?
17. What is the kinetic energy of an object of mass 10 Kg moving with velocity 2 m/s?
18. 5 Kg of steam is enclosed in a container with internal energy = 10 J/Kg, then 25 J of heat is supplied to the system, what is the final internal energy?
19. Liquid benzene having CP = 29 J/oC, is heated from 5oC to 10oC, what is the enthalpy change?
20. If Cp of water is (23 + T) J/oC, what is the enthalpy change of water from 3oC to 5oC?
21. 15 J of work is done by a steady state system, what is the heat supplied to the system?
22. For an open unsteady state system, 10 J of heat was supplied and 10 J of work was done by the system, what is the value of a change in enthalpy?
23. What is the kinetic energy of an object of mass 2 Kg and velocity 5 m/s?
24. What is the change potential energy of a stone of mass 5 Kg that falls from a cliff 10 m high?
25. What is ∆E for a steady-state system?

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