Strength of Nacl in solution

To 5.85gm of Nacl one kg of water is added to prepare of solution. What is the strength of Nacl in this solution (mol. wt. of nacl = 58.5)?

(a) 0.1 Normal (b) 0.1 Molal (c) 0.1 Molar (d) 0.1 Formal

Answer: (b) 5.85 g NaCl = 0.1 mol as it present in 1 kg of water
molality = wt./(m wt. x l) = 5.85/(58.5 x 1) = 0.1 molal

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