Question

The density of 3 M solution of NaCl is
1.25 g ml. Calculate molality of the
solution. Don't copy from anywhere otherwise I will report your answer!​

Answer 1

Answer:

2.79 m

Explanation:

Given :

Molarity M = 3 M

Density d = 1.25 g / mL

We are asked to calculate molality :

We know :

m = ( 1000 × M ) / (  1000 d -  M × MM )

Where m = molality , M = molarity , MM = molar mass and d = density :

Putting values here we get :

m = ( 1000 × 3 ) / ( 1000 × 1.25 - 3 × 58.44 )

= > m = ( 3000 ) / ( 1250 - 175.32 )

= > m = 3000 / 1074.68

= > m = 2.79 m

Hence we get required answer!