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BITSAT Chemistry Thermodynamics (C) 2020 BITSAT 2020

BITSAT Chemistry Question (2020) — Solution

Question

For the combustion reaction at 298 ~K 2 Ag ( s )+1 / 2 O _ 2 ( ~g ) 2 Ag _ 2 O ( s ) Which of the following alternatives is correct?

Options

  1. A. H = U
  2. B. H > U
  3. C. H < U
  4. D. H and U has no relation with each other

Answer

C. H < U

Step-by-step solution

H = U + nRT n = n _ p - n _ R Now, n =2- 5 2 =- 1 2 H = U - 1 2 RT Thus, U = H + 1 2 RT U > H

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