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Chemical Engineering Practice Test: Accounting for Chemical Reaction - Application of Energy Balances in the Absence of Chemical Reactions and Energy Balances
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Topics in this quiz include: Energy balance simplifications and solving, open and closed energy balance applications, enthalpy of formation and reaction, heat of combustion and the concepts of heat merging.
 

Chemical Engineering Practice Test: Accounting for Chemical Reaction - Application of Energy Balances in the Absence of Chemical Reactions and Energy Balances
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25 Questions

1. The specific volume of SO2 is 10 m3/Kg, at 5 Pa, H = 100 J/Kg and at 10 Pa, H = 250 J/Kg, what is the heat transferred to the system?
2. What is the heat transferred to the system, if a change in internal energy is 10 J?
3. Heat of formations of A, B, C, and D, are 2 J, 5 J, 3 J, and 10 J respectively, what is the heat of reaction 4A + 5B -> 2C + 2D?
4. Two feeds, 15 moles with H = 10 J/mole and 10 with H = 20 J/mole, what is the enthalpy of products?
5. What is the enthalpy of the reaction from 25oC to 40oC if CP = 10 J/oC, and the reference enthalpy is 10 J?
6. What is the heat transferred to the system if the enthalpy of the output is 15 J and input is 10 J?
7. What is the heat of reaction if the heat of combustion of products is 10 J and heat of combustion of reactants is 5 J?
8. The specific volume of a gas is 3 m3/Kg, at 6 Pa, H = 4 J/Kg and at 9 Pa, H = 14 J/Kg, what is the heat transferred to the system?
9. In the reaction 2C + O2-> 2CO, if the heat liberated is 10 J, what is the heat of formation of CO?
10. What is the enthalpy of reaction for C + O2 -> CO2, if the conversion of C is 50%, and heat of formation of C, O2, and CO2 are 0, 0 and 10 J.
11. What is the enthalpy of reaction for C2H4 + 3O2 -> 2CO2+ 2H2O, if the conversion of CH4 is 50%, and heat of formation of CH4, O2, CO2, and H2O are 10 J, 0, 6 J and 4 J?
12. What is the heat of reaction if the heat of combustion of products is 10 J and heat of combustion of reactants is 15 J?
13. What is the enthalpy of the reaction from 10oC to 15oC if CP = 5 J/oC, and the reference enthalpy is 25 J?
14. Two feeds, F1 with H = 10 J/mole and F2 with H = 25 J/mole, and product 15 moles with H = 15 J/mole, what is the F2?
15. Heat of formations of A, B, C, and D, are 5 J, 8 J, 2 J, and 15 J respectively, what is the heat of reaction 3A + B -> 3C + 2D?
16. Two feeds, 5 mole with 25 J/mole and F with 5 J/mole, product contains two streams, 5 mole with 10 J/mole and 10 mole with 15 J/mole, what is the value of F?
17. 1 Kg of water is pumped to a height of 1 m, the enthalpy is changed by 5 J/Kg, and work done by the motor is 25 J/Kg, assuming a system is insulated what is the change in internal energy of water?
18. In a reaction the feed is 5 moles of 0.5 glucose and 0.5 sucrose, and another feed of 15 moles of 0.3 glucose and 0.7 sucrose, what is the fraction of glucose in the products?
19. What is the heat transferred from the system if the enthalpy of the output is 5 J and input is 10 J?
20. What is the enthalpy change of a reaction at 30oC, if the enthalpy of reactant at 30oC and 25oC are 18 J and 15 J, and enthalpy of product at 30oC and 25oC are 10 J and 8 J, and the enthalpy change of reaction at 25oC is 45 J?
21. What is the work done for an isobaric process?
22. For an ideal gas isothermal process what is the work done by the gas from 4 Pa to 1 Pa at 300 K?
23. What is the enthalpy of the reaction from 50oC to 52oC if CP = 15 J/oC, and the reference enthalpy is 25 J?
24. In the reaction C + 2H2 -> CH4, if the heat liberated is -5 J, what is the heat of formation of CH4?
25. What is the enthalpy change of a reaction at 90oC, if the enthalpy of reactant at 90oC and 25oC are 60 J and 25 J, and enthalpy of product at 90oC and 25oC are 80 J and 10 J, and the enthalpy change of reaction at 25oC is 5 J?

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