Chapter 13, Problem 13.73SP

Interpretation Introduction

Interpretation:

The molarity of a solution of ethylene glycol in water needs to be determined if the mass % of the solution is 40.0 and the density of the solution is 1.0514 g/mL at 20.0°C.

Concept introduction:

Solution stoichiometry involves the calculation of the concentration of solutions in the given conditions of volumes, moles, etc. There are various ways to calculate the concentration of solutions such as molarity, molality, mole fraction, ppm, ppb, etc. Mole fraction is the ratio of moles of substance and total moles in the solution or mixture. One ppm stands for part per million or milligrams per liter (mg/L), whereas parts per billion (ppb) is one part in 1 billion.

Molarity represents the moles of solute dissolve in per liter of the solution. The mathematical expression of molarity is:

$\text{Molality=}\frac{\text{Moles of solute}}{\text{Volume of solution (L)}}$