The ratio of the spin-only magnetic moment of [Fe(H2O)6]^3+ to that of [Fe(CN)6]^3- is closest to:

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The ratio of the spin-only magnetic moment of $[Fe (H X_{2} O) X_{6}] X^{3 +}$ to that of $[Fe (CN) X_{6}] X^{3 -}$ is closest to:

[Fe (H X_{2} O) X_{6}] X^{3 +}

is high spin

d^{5}

with

n = 5

(

μ = 35

[Fe (CN) X_{6}] X^{3 -}

is low spin

t_{2 g}^{5}

with

n = 1

(

μ = 3

). The ratio is

35/3 = 3.42