Q 1270080816.     An element `X`(Atomic mass = `25`) exists as `X_4` is benzene. `51g` of saturated solution of `X` in benzene was added to `50.0` g of pure benzene. The resulting solution showed a depression of freezing point of `0.55` K. Find the solubility of `X` per `100` g of benzene, (`K_f` for benzene `= 5.5` K kg `mol^(–1)`)

A

`2.0 g`

B

`2.5 g`

C

`4.1 g`

D

`3.2 g`

HINT

Use formula: `ΔT_f =( 1000 K_fw_A)/(M_Bw_B)`

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