A solution of sodium sulfate contains $92 \mathrm{~g}$ of $\mathrm{Na}^{+}$ions per kilogram of water. The molality of $\mathrm{Na}^{+}$ions in that solution in $\mathrm{mol} \mathrm{kg}^{-1}$ is:
16
8
4
12
Correct Option: , 4
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