Chemistry - Thermodynamics - II Question with Solution | TestHub

ChemistryThermodynamics - IIAdiabatic Process/PolytropicMedium2 minPYQ_2020
ChemistryMediumsingle choice

What is the value of Δ G kJ / mol at 298 K at some non-equilibrium condition? Given the concentrations of [NH3] is 0.05 M and [NH4+] = [OH-] = 0.002 M in the presence of excess water. Also Δ G Reaction  = + 2 6 · 8 1  KJ  mol .

NH 3 (aq)+ H 2 O(l) NH 4 + (aq)+ OH (aq)

Options:

Answer:
A
Solution:

Δ G = Δ G + 2 . 3 0 3  RT  log  Q
= 2 6 . 8 1  kJ + 2 . 3 0 3 × 8 . 3 1 4 × 2 9 8  log 2 × 1 0 - 3 × 2 × 1 0 - 3 5 × 1 0 - 2
= 2 6 . 8 1 kJ + 5 7 0 6 J  log  4 5 × 1 0 - 4
= 2 6 . 8 1 + 5 . 7 0 6 - 4 + 0 . 6 0 - 0 . 7
= 2 6 . 8 1 + 5 . 7 0 6 - 4 . 1
= 2 6 . 8 1 - 2 3 . 3 7
=3.44  kJ mol 1

Stream:NTA_ABHYASSubject:ChemistryTopic:Thermodynamics - IISubtopic:Adiabatic Process/Polytropic
2mℹ️ Source: PYQ_2020

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