Chapter 13, Problem 65QRT

Interpretation Introduction

Interpretation:

Solutions have to be listed in the order of increasing boiling point.

Concept introduction:

Boiling point is the temperature at which liquid turns into a gas. Example: boiling point of water is $\text{100}{}^{\text{o}}\text{C}$. That is water changes from liquid phase to gas phase.

  ${\text{ΔT}}_{\text{b}}{\text{= T}}_{\text{b}}{\text{- T}}_{\text{b}}^{\text{°}}$.

Where,

  ${\text{ΔT}}_{\text{b}}-$ Change in boiling point.

  ${\text{T}}_{\text{b}}-$ Boiling point of the solution.

  ${\text{T}}_{\text{b}}^{\text{°}}-$ Boiling point of pure solvent.

Boiling point elevation$({\text{ΔT}}_{\text{b}})$ is depicted as follows,

  ${\text{ΔT}}_{\text{b}}{\text{= K}}_{\text{b}}\text{m}$.

Where,

  ${\text{ΔT}}_{\text{b}}-$ Change in boiling point

  ${\text{K}}_{\text{b}}-$ Molal boiling point constant.

  $m-$ Molality of the solution.

Moles: One mole is equivalent to the mass of the substance consists same number of units equal to the atoms present in $\text{12}\text{g}$ of ${}^{\text{12}}\text{C}$.

From given mass of substance moles could be calculated by using the following formula,

  $\text{Moles}\text{of}\text{substance }\text{= }\frac{\text{Given}\text{mass}\text{of}\text{substance}}{\text{Molecular}\text{mass}}$.

Mass: It is the quantitative measure of a substance. The amount of matter present in substance is expressed as mass. The $S.I.$ unit of mass is $kg$.