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Chemical Engineering Thermodynamics Test Questions and Answers
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Chemical Engineering Thermodynamics Test
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Chemical Engineering ThermodynamicsTest
1st Law of Thermodynamics - answer “Energy cannot be created or destroyed by any
process."
"In all cases in which work is produced by the agency of heat, a quantity of heat is
consumed which is proportional to the work done; and conversely, by the expenditure of
an equal quantity of work an equal quantity of heat is produced."
"Changes in any form of energy—thermal, mechanical, kinetic, potential, etc.—can
always be accounted for by equal and opposite changes in other forms."
2nd Law of Thermodynamics - answer “It is impossible to construct a heat engine that,
operating continuously, will produce no effect other than the transfer of heat from a
single thermal reservoir at uniform temperature and the performance of an equal
amount of work."
3rd Law of Thermodynamics - answer"The entropy of a perfect crystal approaches a
universal minimum as the temperature is reduced to absolute zero."
"The entropy change associated with any condensed system undergoing a reversible
isothermal process approaches zero as the temperature at which it is performed
approaches absolute zero."
"It is impossible for any process, no matter how idealized, to reduce the entropy of a
system to its absolute-zero value in a finite number of operations."
"The standard entropy change of reaction decreases to zero as the temperature
approaches absolute zero."
Fugacity - answerThe escape tendency of a chemical. It is minimized at equilibrium, and
the fugacities of two substances in the same phase are equal at equilibrium. It is defined
mathematically as :
GR=RTlog(f/P) or Goverbar=G⁰+RTlog(fhat/f)
Fugacity Coefficient - answerIt is phi
phi=f/P for pure substances
phi hat= fhat/xP
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