What's the molality of a solution with 120 g of NaCl and 30 kg of water? A)

0.068

B)

0.004

C)

0.25

D)

6.8

The correct option is A) 0.068 m

Explanation:

Molality is defined as the amount of solute expressed in the number of moles present per kilogram of solvent. The units of molarity are mol/kg. The formula used to calculate molarity:

.....(1)

We are given:

Given mass of NaCl = 120 g

Molar mass of NaCl = 58.45 g/mol

Mass of solvent = 30 kg

Putting values in equation 1, we get:

Hence, the correct option is A) 0.068 m