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Which of the following is the correct unit of the molal freezing point depression constant $K_{f}$ ?

A $K mol L^{- 1}$
B $mol kg K^{- 1}$
C $K mol k g^{- 1}$
D $K kg mo l^{- 1}$

Answer: D

Since

Δ T_{f} = K_{f} m

,

K_{f} = Δ T_{f} / m

. With

Δ T_{f}

in

K

and

m

in

mol k g^{- 1}

, the unit of

K_{f}

is

K kg mo l^{- 1}

.

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