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