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A solution of sodium sulphate contains 92 g of Na + ions per kilogram of water. The molality of Na + ions in that solution in mol kg - 1 is:

Options

  1. A16
  2. B4
  3. C12
  4. D8

Correct answer

B. 4

Step-by-step solution

Moles of N a + = W e i g h t   o f   N a +   i o n s M o l e c u l a r   w e i g h t = 92 23 = 4 Molality is number of moles of solute present per Kg of Solvent 4 mole of N a + are present in 1 kg of water Hence, molality of N a + ions will be 4

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