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Solution


Q.

Molality (m) of 3 M aqueous solution of NaCl is:
(Given: Density of solution = 1.25 g mL-1, Molar mass in g mol-1: Na - 23, Cl - 35.5)                  [2024]
1 2.90 m  
2 2.79 m  
3 1.90 m  
4 3.85 m  

Ans.

(2)

     3M aqueous NaCl means:

     3 mol NaCl in 1000 mL solution

     3×58.5 g=175.5 g NaCl in 1.25 g mL-1×1000 mL-1250 g solution

     3 mol NaCl in (1250-175.5) g=1074.5 g=1.074 kg solution

     m=nsoluteVsolvent (in kg)=31.0745 m=2.79 m