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A solution of sodium sulfate contains 92 g Na^+ of ions per kilogram of water.

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

(1)  16 

(2)  8 

(3)  4 

(4)  12 

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Best answer

Correct option  (3) 4 

Explanation:

nna+  = 92/23 = 4

So molality = 4

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