Explain how to create a 100 mL solution of 15% NaOH by mass in water. Given the density of H2O =...

Question:

Percent by Mass

The concentration of a solution can be expressed in percent by mass. In this unit of concentration, the mass of the solute is divided by the mass of the solution and multiplied by 100. Since the solution contains a solute and a solvent, the denominator of the formula is the sum of the mass of the solute and the mass of the solvent.

{eq}\begin{aligned} Percent\;by\;mass\;&=\;\frac{mass\;solute}{mass\;solution}\;\times\;100\\ Percent\;by\;mass\;&=\;\frac{mass\;solute}{mass\;solute\;+\;mass\;solution}\;\times\;100\ \end{aligned} {/eq}

Answer and Explanation: 1