# Freezing point of a 4% aqueous solution of X is equal to freezing point of 12% aqueous solution of Y. If molecular weight of X is A, then molecular weight of Y is :Option 1)AOption 2) 4AOption 3) 3AOption 4) 2A

Molar Mass -

The mass of one mole of a substance in grams is called its molar mass.

- wherein

Molar mass of water = 18 g mol-1

Mole Concept -

One mole is the amount of a substance that contains as many particles or entities as there are atoms in exactly 12 g (or 0.012 kg) of the 12C isotope.

- wherein

one mole = 6.0221367 X 1023

As we have learned in mole concept

$\left ( \Delta T_{f} \right )_{x}= \left ( \Delta T_{f} \right )_{y}$

$K_{f}m_{x}= K_{f}m_{y}$

$\frac{4\times 1000}{A\times 96}= \frac{12\times 1000}{m\times 88}$

$M= 3.27A\simeq 3A$

Option 1)

A

Option 2)

4A

Option 3)

3A

Option 4)

2A

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