Chemical Engineering Thermodynamics - Study Mode
[#291] Gibbs free energy at constant pressure and temperature under equilibrium conditions is
Correct Answer
(D) Minimum
Explanation
Solution: The gibbs free energy change as given by second law of thermodynamics goes on decreasing for an spontaneous irreversible process of constant temperature and pressure and finally when it is reached equilibrium the change is zero. Hence we can say a minimum exists for gibbs free energy.
[#292] Free energy change at equilibrium is
Correct Answer
(A) Zero
Explanation
Solution: The gibbs free energy change as given by second law of thermodynamics goes on decreasing for an spontaneous irreversible process of constant temperature and pressure and finally when it is reached equilibrium the change is zero. Hence we can say a minimum exists for gibbs free energy.
[#293] $$gamma $$ = specific heat ratio of an ideal gas is equal to
Correct Answer
(D) All of the above
Explanation
Solution: The specific heat ratio is given by $$gamma = frac{{{C_P}}}{{{C_V}}}$$ Since for an ideal gas $${C_P} - {C_V} = R$$ So, the given all results are correct.
[#294] The standard Gibbs free energy change of a reaction depends on the equilibrium
Correct Answer
(B) Temperature
[#295] In the ammonia synthesis reaction, N 2 + 3H 2 ⇋ 2NH 3 + 22.4 kcal, the formation of NH₃ will be favoured by
Correct Answer
(D) Both low temperature and high pressure
Explanation
Solution: Since, the given reaction is an exothermic reaction and change in moles is negative so, by Le Chatelier's principle we can say the reaction is favored by low temperature and high pressure.