Question

5) Calculate the molality of 0.210 mol of KBr dissolved in 0.075kg pure
water.

Answer 1

2.8 m

Step-by-step explanation:

Step 1: Given data

• Moles of potassium bromide (solute): 0.210 mol

• Mass of water (solvent): 0.075 kg

Step 2: Calculate the molality of the solution

Molality is a unit used to express the concentration of a solution. It is equal to the moles of solute divided by the kilograms of solvent.

m = moles of solute / kilograms of solvent

m = 0.210 mol / 0.075 kg

m = 2.8 mol/kg = 2.8 m