Chapter 17, Problem 18E

Interpretation Introduction

Interpretation: The concentration of ethanol in wine in terms of mass percent and molality needs to be determined.

Concept introduction: To calculate mass percent of component A of a solution having two components A and B, use the formula given below.

  $\text{Mass}\text{percent=}\frac{\text{Mass}\text{of}\text{A}}{\text{Mass}\text{of}\text{A}+\text{Mass}\text{of}\text{B}}\times 100\%$

To calculate moles use the below formula.

  $\text{Number}\text{of}\text{moles=}\frac{\text{Mass}}{\text{Molar}\text{mass}}$

To calculate molality, use the below formula.

  $\text{Molality=}\frac{\text{Moles}\text{of}\text{solute}}{\text{Mass}\text{of}\text{solvent}\text{in}\text{kg}}$