(ΔH – ΔU) for the formation of carbon monoxide (CO) from its elements at 298 K is (R = 8.314 JK–1 mol–1)

  1. 1238.78 J/mol
  2. 2477.57 J/mol
  3. –2477.57 J/mol
  4. –1238.78 J/mol

Answer

ΔH – ΔU = ΔngRT

Reaction for the formation of carbon monoxide is:

C (s) + ½O2 (g) ⟶ CO (g)

Δng = 1 - 1/2 = 1/2

ΔH – ΔU = 1/2 x 8.314 x 298

= 1238.78 J/mol

The correct option is A.

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