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Elementary Principles of Chemical Processes | 4th Edition | ISBN: 9780470616291 | Authors: Richard M. Felder Ronald W. Rousseau, Lisa G. Bullard
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Chlorine gas is to be heated from 120C and 1 atm to 180C. (a) Calculate the heat input

Chapter 8, Problem 8.11

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QUESTION:

Chlorine gas is to be heated from 120C and 1 atm to 180C. (a) Calculate the heat input (kW) required to heat a stream of the gas flowing at 15.0 kmol/min at constant pressure. (b) Calculate the heat input (kJ) required to raise the temperature of 15.0 kmol of chlorine in a closed rigid vessel from 120C and 1 atm to 180C. (Suggestion: Evaluate U^ directly from the result of the first calculation, so that you do not have to perform another integration.) What is the physical significance of the numerical difference between the values calculated in Parts (a) and (b)? (c) To accomplish the heating of Part (b), you would actually have to supply an amount of heat to the vessel greater than the amount calculated. Why?

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QUESTION:

Chlorine gas is to be heated from 120C and 1 atm to 180C. (a) Calculate the heat input (kW) required to heat a stream of the gas flowing at 15.0 kmol/min at constant pressure. (b) Calculate the heat input (kJ) required to raise the temperature of 15.0 kmol of chlorine in a closed rigid vessel from 120C and 1 atm to 180C. (Suggestion: Evaluate U^ directly from the result of the first calculation, so that you do not have to perform another integration.) What is the physical significance of the numerical difference between the values calculated in Parts (a) and (b)? (c) To accomplish the heating of Part (b), you would actually have to supply an amount of heat to the vessel greater than the amount calculated. Why?

ANSWER:

Step 1 of 4

Here, the heating process is conducted by putting pressure at a constant value.

Therefore,

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