If the Helmholtz energy of a reaction is closed system is positive (at constant Volume and Temperatu
tiyakexdw4
Answered question
2022-05-14
a) It is negative
b) It is positive
c) It is equal to 0
d) It depends on the value of the enthalpy of the reaction
e) None of the above
Answer & Explanation
lutzantsca885
Beginner2022-05-15Added 15 answers
Mathematically it is given by-
Helmohltz free energy: F = U−TS
From the second law of thermodynamics
Internal energy at constant volume and temperature is a function of entropy (S) only.
=>Helmohltz free energy at constant volume and temperature is Q - TS
Now Q -TS to be positive, S must be negative as T can never be negative.
Thus, change in entropy of system must be negative for positive Helmholtz free energy closed system at constant temperature and volume.
Correct option is (a).
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