One of the reactions used to inflate automobile air bags...

One of the reactions used to inflate automobile air bags involves sodium azide $\left(\mathrm{NaN}_{3}\right) : 2 \mathrm{NaN}_{3}(\mathrm{s}) \rightarrow 2 \mathrm{Na}(\mathrm{s})+3 \mathrm{N}_{2}(\mathrm{g})$ mass of $\mathrm{N}_{2}$ produced from the decomposition of NaN $_{3}$ shown at right.

Key Concepts

Mole Concept

The mole concept is the link between the mass of a substance and the number of particles (atoms, molecules, ions) it contains. It provides a way to count entities by relating a measurable mass to a specific number of particles, defined by Avogadro's number, which is crucial for stoichiometric calculations.

Molar Mass

Molar mass is the mass of one mole of a substance and is expressed in grams per mole. It serves as the conversion factor between the mass of a substance and the amount in moles, allowing chemists to connect the macroscopic measurements made in the laboratory with the microscopic quantities defined in chemical equations.

Balanced Chemical Equations

Balanced chemical equations are essential for understanding chemical reactions because they show the correct proportions of reactants and products. These equations ensure that atoms are conserved according to the law of conservation of mass, providing the stoichiometric ratios needed for quantitative analysis of substances involved in the reaction.

Stoichiometry

Stoichiometry involves using the mole ratios from a balanced chemical equation to calculate the amounts of reactants and products. It is a fundamental aspect of chemistry that allows one to predict how much of a product will form from a given amount of reactant, or vice versa, by relating amounts in moles through the coefficients in the equation.

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