A solution of sodium sulphate contains \( 92 \mathrm{~g}_{\text {of } \mathrm{Na}^{+}} \) ions p...

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A solution of sodium sulphate contains \( 92 \mathrm{~g}_{\text {of } \mathrm{Na}^{+}} \) ions per kilogram of water. The Molality of \( \mathrm{Na}^{+} \)ions in that solution in \( \mathrm{mol} \mathrm{\textrm {kg } ^ { - 1 } \text { is }} \)
(1) 12
(2) 4
(3) 8
(4) 16
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