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JEE Main 20205 SeptemberEvening Shift
Exam
JEE Main
Year
2020
Date
5 September
Shift
Evening Shift
Subject
Chemistry
Chapter
Thermodynamics (C)

JEE Main 2020 · 5 September · Evening Shift · Chemistry · Thermodynamics (C)

For a dimerization reaction, 2A ( g ) → A _ 2 ( g ) at 298K, Δ U ^...

For a dimerization reaction,

2A(g)→A2(g)2A ( g ) \to {A}_{2} ( g )

at 298K,ΔU−=−20kJmol−1,ΔS−=−30JK−1mol−1298K, \Delta{U}^{-} = - 20{kJmol}^{- 1}, \Delta{S}^{-} = - 30{JK}^{- 1}{mol}^{- 1},then the ΔG−\Delta{G}^{-} will be …..J.

Correct answer

13538

Step-by-step solution

From \DeltaH=\DeltaU+δngRT\DeltaH = \DeltaU + \delta ngRT

Δ=−20×1000−1×8.314J/mol.K×298K\Delta = - 20 \times 1000 - 1 \times 8 .314 J / mol . K \times 298K

=−22477.572J= - 22477 .572 J

.\DeltaG=\DeltaH−T\DeltaS\DeltaG = \DeltaH - T\DeltaS

=−13537.572J= - 13537 .572 J

=−13538J= - 13538J

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