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Molality

Question 24 4...

Question

Question 24
4 L of 0.02 M aqueous solution of NaCl was diluted by adding 1 L of water. The molality of the resultant solution is ........ .
(a) 0.004 (b) 0.008 (c) 0.012 (d) 0.016

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Solution

(d) Given $M_{1} = 0.02 M V_{1} = 4 L, M_{2} = ? V_{2} = 4 L + 1 L = 5 L A s w e k n o w, M_{1} V_{1} = M_{2} V_{2} 0.02 \times 4 L = M_{2} \times 5 L M_{2} = \frac{0.08}{5} = 0.016 M$

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