Chapter 23, Problem 79AP

Interpretation Introduction

Interpretation:

The percent compositions of sodium oxide and sodium peroxide are to be determined with given mass of sodium and combined mass of sodium oxide and sodium peroxide.

Concept Introduction:

The percent composition is defined as the percentage by mass of each element in a compound.

The percentage of sodium in both the compounds is determined by the equation.

$\%\text{mass}=\frac{m_{\text{c}}}{m_{\text{t}}}\times 100.$

Here, $\%\text{mass}$ is the percentage mass of component, $m_{\text{c}}$ is the mass of the component, and $m_{\text{t}}$ is the total mass of the compound.

The molar mass of sodium is $22.99\text{}\text{ g}/\text{mol}$.

The molar mass of ${\text{Na}}_2\text{O}$ is $61.98\text{}\text{ g}/\text{mol}$.

The molar mass of ${\text{Na}}_2{\text{O}}_2$ is $77.98\text{}\text{ g}/\text{mol}$.

The equation of total mass of the compound is as

$\text{given mass of Na}={\text{mass of Na in Na}}_2\text{O}+{\text{mass of Na in Na}}_2{\text{O}}_2$.