Answer to Question #139653 in Physics for Harvey Jed A. Iman

Question

A sample of 0.892 g of potassium chloride (KCl) is dissolved in 54.6 g of water. What is the percent by mass of KCl in this solution?
Calculate the percent by volume of 20 mL of alcohol diluted in water to produce 250mL solution.

Answer 1

The percent by mass of KCl in this solution is

$$\omega=\frac{m_\text{KCl}}{m_\text{KCl}+m_{\text{H}_2\text{O}}}100\%=1.6\%.$$

The percent by volume of 20 mL of alcohol diluted in water to produce 250mL solution is

$$\phi=\frac{V_{al}}{V_{sol}}100\%=\frac{20}{250}100\%=8\%.$$