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)

    A

  • Option 2)

     4A

  • Option 3)

     3A

  • Option 4)

     2A

Answers (1)
A admin

 

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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