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Rank the following ions in the weak octahedral field in order of increasing Jahn-Teller effect. (22Ti, 24Cr, 25Mn)
I- Ti3+ II- Cr3+ III- Mn3+
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- A 3.03-g petroleum specimen was decomposed by wet ashing and subsequently diluted to 500 mL in a volumetric flask. Cobalt was determined by treating 25.00-mL aliquots of this diluted solution as follows: Assume that the Co(II)-ligand chelate obeys Beer’s law, and calculate the percentage of cobalt in the original sample.Rank the following ions in the weak octahedral field in order of increasing Jahn-Teller effect. (22Ti, 24Cr, 25Mn) I- Ti3+ II- Cr3+ III- Mn3+ A. I < III < IIB. II < III < IC. III < II < ID. II < I < IIIE. I < II < IIIThree absorption bands were observed at 11200, 18350, 29000 cm-1 in the electronic spectrum of the [Ni(en)3]2+ complex. What is the ligand field transition corresponding to the absorption band at 18350 cm-1? (28Ni)
- There has been three bands (264 nm, 408 nm and 575 nm) observed in the UV-Vis spectrum of the complex K[Cr(H2O)6](SO4)2.6H2O. Calculate CFSE and LFSE as kjmol-1 and kcalmol-1. (Cr:24) (1kJ/mol=83,6cm-1)What is the electron configuration of the [Fe (CN) 6] 3-complex according to the molecular orbital approximation? (26Fe) A. (a1g) 2 (t1u) 6 (eg) 4 (t2g) 4 (eg *) 1B. (a1g) 2 (t1u) 6 (eg) 4 (t2g) 5C. (a1g) 2 (t1u) 6 (eg) 4 (t2g) 3D. (a1g) 2 (t1u) 6 (eg) 4 (t2g) 3 (eg *) 2At 580 nm, the wavelength of its maximum absorption, the complex Fe(SCN)2+ has a molar absorptivity of 7.00x103 L mol-1 cm-1. Calculate letter D ONLY a.) the absorbance of 2.50x10-5 M solution of the complex at 580 nm in 1.00-cm cell. = 0.175 b.) the absorbance of a solution in which the concentration of the complex is twice that in part (a). c.) the transmittance of the solutions described in parts (a) and (b). d.) the absorbance of a solution that has half the transmittance of that described in part (a).
- In which of the following compounds the magnetic moment is zero? (28Ni,26Fe, 24Cr) A. Na3 [FeF6]B. [Cr (H2O) 6] SO4C. K4 [Fe (CN) 6]D. [Ni (NH3) 6] Cl2what is the LFSE for [Co(bipy)3]^2+? splitting parameter is 11300cm-1 pairing energy is 22500cm-1Provide brief well focused responses to the following questions. Why is Δo for the [Cr(CN)6]3- anion very much larger than Δo for [CrCl6]3-? Qualitatively compare the expected μeff (298K) values for the octahedral complex anions [CrCl6]3- and [Cr(CN)6]3- .
- A student has succeeded in identifying 2 types of complex compounds, the first compound (Odd Student ID) has percentage of Pt 52.6%; N 7.6%; H 1.63%; and 38.2% Cl with a central atomic charge of +4, while the second compound has composition of Co 22.0%; N 31.4%; H 6.78%; and 39.8% Cl with a central atomic charge of +3. a) Determine the empirical formula of both complex compounds! b) Draw the chemical structure and give name of both complex compounds!The observed absorption band of the M2+ ion in the electronic spectrum of the hexaaqua complex is 7500 cm-1. How many kJ / mol is the crystal field cleavage of the tetraaqua complex of the same ion? (h = 6,626x10-34Js, c = 3x108ms-1)13+ 25. (a) The value of Ao in [Mn(H₂O)6]³+ is 15,800 cm-1 while the mean pairing energy (P) in this complex is 28,000 cm-1. Do you expect this ion to be high or low spin? (b) Determine whether either spin state for the complex is likely to be subject to a Jahn-Teller distortion. If it can occur, which spin state would display the greater effect?