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Question
4 L of 0.02 M aqueous solution of NaCl was diluted by adding one litre of water. The molality of the resultant solution is ______.
Options
0.004
0.008
0.012
0.016
Solution
4 L of 0.02 M aqueous solution of NaCl was diluted by adding one litre of water. The molality of the resultant solution is 0.016.
Explanation:
Apply the relation: M1V1 = M2V2
Given: M1 = 0.02 M, V1 = 4 L, M2 = ?, V2 = 5 L
Therefore 0.02 × 4 L = M2 × 5 L
M2 = `0.08/5` = 0.016 M
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