CHM110H5 Chapter Notes -Molality, Hexane, Dichloromethane

• School: UTM
• Department: Chemistry
• Course: CHM110H5
• Professor: Judith C Poe

Document Summary

As discussed in the lectures, both molarity and molality, are units that describe a mixture or solution"s concentration. Molarity can be defined as the amount of solute (in moles) in 1 l of solution. Solution in this case would refer to solute and solvent together. Molality, on the other hand, can be defined as the amount of solute (in moles) in 1 kg of solvent. The main difference to be noted here is that. Molality does not take into account the whole solution (solute + solvent) but that it only takes into account the solvent. Though the unit of measurements are different in both molality (mol/kg) and molarity (mol/l), the difference is negligible as water is the solvent in aqueous solutions and its density at 25 c is approximately 1kg/l. 35. 0 ml acetone were mixed with 65. 0 ml water resulting in a solution with a volume of 97. 0 ml. The density of pure acetone is 0. 792 g/ml.