A solution of sodium sulphate contains 92 g \[\text{N}{{\text{a}}^{+}}\]of ions per kilogram of water. The molality of \[\text{N}{{\text{a}}^{+}}\]ions in that solution in \[\text{K}{{\text{g}}^{-1}}\] is:
A)16
B)8
C)4
D)12
Correct Answer:
C
Solution :
\[{{n}_{n{{a}^{\,\,+}}}}=\,\frac{92}{23}\,=\,4\] So, molality = 4