Which statement explains why an increase in molality increases the boiling point of a solution? the addition of solute decreases the solvent’s vapor pressure. a higher temperature must then be applied to overcome the change. the addition of solute increases the solvent’s vapor pressure. a higher temperature must then be applied to overcome the change. the addition of solute increases the solvent’s ability to boil. the solute’s molecules repel the solvent’s molecules, giving them higher binding energy and hence the need for higher temperature.

The addition of solute decreases the solvent’s vapour pressure. A higher temperature must then be applied to overcome the change.  

Decreasing the vapour pressure decreases the solvent’s ability to boil.

The correct statement is that the addition of solute decreases the solvent’s vapor pressure. A higher temperature must then be applied to overcome the change.

Explanation:

Molality also knew as molal concentration refers to a determination of the concentration of a solute in a solution in terms of the concentration of a substance in a particular amount of mass of the solvent.  

The statement, which illustrates that an increase in molality enhances the boiling point of a solution is that the supplementation of solute reduces the vapor pressure of the solvent, and in order to overcome the change temperature must be applied. With the decrease in vapor pressure, the tendency of the solvent to boil also diminishes.  

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