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

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Q. A solution of sodium sulfate contains $92\, g$ of $Na^{+}$ ions per kilogram of water. The molality of $Na^{+}$ ions in that solution in $mol \; kg^{-1}$ is:

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Solution:

$n_{Na^{+}} = \frac{92}{23} = 4 $
So molality = 4