4L of 0.02 M aqueous solution of NaCl was diluted by adding one litre of water. The molality of the resultant solution is _____________.

Home » 4L of 0.02 M aqueous solution of NaCl was diluted by adding one litre of water. The molality of the resultant solution is _____________.

4L of 0.02 M aqueous solution of NaCl was diluted by adding one litre of water. The molality of the resultant solution is _____________.

(i) 0.004

(ii) 0.008

(iii) 0.012

(iv) 0.016

Correct Answer: (iv) 0.016

Explanation:

Let us take,

M1 and V1 – molarity and volume of the given solution.

M2 and V2 – molarity and volume of the resulting solution.

M1=0.02M

V1 = 4L

V2 = 5L

0.02×4 = M2×5

Hence, M2=0.016M

i

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