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Question

In the solution of Na2SO4 the weight of Na+ is 92g. What is the molality of Na+ per kg of water?


A

2

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B

4

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C

6

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D

8

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Solution

The correct option is B

4


The explanation for the correct options (B) 4

Step 1:

  • Given the weight of sodium is 92g.
  • The molecular weight of sodium is 23g/mol.

Step 2:

  • Molality=weightmolecularweight
  • As given in the formula
  • Molality=9223=4molal

Hence, option (B) is correct., the molality of Na+ per kg of water is 4molal.


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