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  • The density of 3M solution of sodium chloride is 1.252 g mL-1. The molality of the solution will be :  (molar mass , NaCl = 58.5 g mol<img alt="^{-1}" src="https://en

The density of 3M solution of sodium chloride is 1.252 g mL-1. The molality of the solution will be : 

(molar mass , NaCl = 58.5 g mol^{-1})

Option: 1

2.60 m


Option: 2

2.18 m


Option: 3

2.79 m


Option: 4

3.00 m


Answers (1)

best_answer

We know that molar mass of NaCl = 58.5g

Thus, number of moles of NaCl = given weight / molecular weight

Thus, mass of NaCl in 1L solution = 175.5g

Now, we have density = mass/ volume

Thus, mass of 1 litre of solution = 1000 x 1.252
                                               = 1252g

Therefore, mass of water = 1252 - 175.2
                                     = 1074.5g

Therefore, molality of solution = 3/1.0745
                                            = 2.79

Therefore, Option(3) is correct

  

Posted by

shivangi.bhatnagar

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