Answer:
Option A
Explanation:
Plane This problem can be solved by using concept of conversion of molarity into molality.
Molarity=3.2 M
Let volume of solution=1000mL=volume of solvent
Mass of solvent =1000 x 0.4 =400g
Since, molarity of solution is 3.2 molar
∴ nsolute=3.2mol
Molality (m)= 3.2400/1000=8
Hence, correct integer is (8)