Chapter 13.5, Problem 1.3ACP

Interpretation Introduction

Interpretation: it should be determined that the mass percent of hexane in a mixture with heptane if the mole fraction of hexane is $0.20$.

Concept introduction:

• Mole fraction is one of the concentrations expressing term which is equal to the number of moles of a component divided by the total number of a solution. The mole fraction of all components of a solution, when added together will equal to $1$

  The mole fraction of component a can be determined by using the equation,

      $\text{Mole}\text{fraction}\text{of}\text{a}{\text{(X}}_{\text{a}}\text{)}=\frac{\text{Mole}\text{of}\text{a}}{\text{Total}\text{moles}}$

• Percentage by mass: ratio of amount of solute to amount of solution and multiplied with $\text{100}$.

  $\text{percent}\text{by}\text{mass}\text{=}\frac{\text{amount}\text{of}\text{solute}}{\text{amount}\text{of}\text{solute}\text{+}\text{amount}\text{of}\text{solvent}}\text{×}\text{100\%}$

• $\text{Mass}\text{of}\text{the}\text{substance}\text{=}\text{Amount}\text{of}\text{the}\text{substance}\text{×}\text{Molar}\text{mass}$