An octahedral complex ion is found to have ΔE = 219 kJ/mol. What color is this...

Question

Question

An octahedral complex ion is found to have ΔE = 219 kJ/mol. What color is this complex?

Answer 1

Answer #1

Energy = 219 kJ/mol

Energy = 219 x 10³ J/mol

Wavelength of photon = [(h) * (c) * (N_A)] / (Energy)

where

h = Planck's constant = 6.626 x 10^-34 J.s

c = speed of light = 3.0 x 10⁸ m/s

N_A = Avogadro's number = 6.022 x 10²³ photons/mol

Substituting the values,

Wavelength of photon = [(6.626 x 10^-34 J.s) * (3.0 x 10⁸ m/s) * (6.022 x 10²³ photons/mol)] / (219 x 10³ J/mol)

Wavelength of photon = 5.466 x 10^-7 m

Wavelength of photon = 5.466 x 10^-7 m * (10⁹ nm / 1 m)

Wavelength of photon = 546.6 nm

The color corresponding to this wavelength is green (500 - 565 nm)

Hence, the color of complex ion should be green.

Answer 2

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