If the crystal field splitting energy of [Co (NH₃)₄]²⁺ is 5900 cm⁻¹, then the magnitude of its crystal field… · ABC26IN0658

Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Coordination Compounds – General · Exam: JAM 2005-2022 · Marks: 2 · Difficulty: Medium

If the crystal field splitting energy of $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}$ is $5900 \mathrm{cm}^{-1}$, then the magnitude of its crystal field stabilization energy, in $\mathrm{kJ} \mathrm{mol}^{-1}$ (rounded off to one decimal place), is ____ .
Answer
SELF-PRACTICE — the source book printed no answer.

Nothing is invented here, so this question has no answer on record.

Explanation
Answer: ≈ 84.7 kJ mol⁻¹ — Tetrahedral Co²⁺ d⁷ (e⁴t₂³): |CFSE| = 4(0.6) − 3(0.4) = 1.2Δt = 7080 cm⁻¹ × 0.011963 = 84.7 kJ mol⁻¹.

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