A solution of 0.816g of a compound ‘A’ dissolved in 7.5g of Benzene freezes at 1.590C . The molecular weight of compound ‘A’ if Kf of benzene is 4.9 and melting point of Benzene is 5.510C

A
120
B
136
C
32
D
180

Solution:

It is a colligative property of solutions that is generally proportional to the molality of the added solute. The depression in the freezing point of a solution can be described by the following formula.

ΔT_f = K_f× m

Where

ΔT_f is the freezing point depression
K_f is the cryoscopic constant, and
m is the molality.

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A solution of 0.816g of a compound ‘A’ dissolved in 7.5g of Benzene freezes at $1 {.59}^{0} C$ . The molecular weight of compound ‘A’ if $K_{f}$ of benzene is 4.9 and melting point of Benzene is $5 {.51}^{0} C$

Solution:

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