If you had equal masses of the substances in the following...

If you had equal masses of the substances in the following pairs of compounds, which of the two would contain the greater number of ions? (a) $\mathrm{NaBr}$ or $\mathrm{KCl} ;$ (b) $\mathrm{NaCl}$ or $\mathrm{MgCl}_{2} ;(\mathrm{c}) \mathrm{CrCl}_{3}$ or $\mathrm{Na}_{2} \mathrm{S}$

Key Concepts

Chemical Formula and Formula Unit

The chemical formula provides the ratio of atoms in a compound and indicates the number of ions in its formula unit. Understanding the formula unit is necessary to calculate the total number of ions produced from a given substance based on its dissociation into constituent ions.

Ionic Compounds and Their Dissociation

Ionic compounds dissociate into ions when dissolved in water or considered in the context of their formula unit composition. The number of ions produced depends on the compound's chemical formula, where each formula unit yields a specific number of ions, making this information vital for comparing ion counts in equal masses of different compounds.

Molar Mass

Molar mass is the mass of one mole of a substance, expressed in grams per mole. It is essential for converting a given mass of a compound into the number of moles, which then allows one to determine quantities such as the number of formula units or ions present.

Mole Concept

The mole concept relates the mass of a substance to the number of particles (atoms, molecules, or ions) it contains using Avogadro's number. This concept is crucial for quantifying and comparing the number of ions produced from different substances when equal masses are provided.

Stoichiometric Calculations

Stoichiometry involves the quantitative relationships between reactants and products in a chemical reaction or when considering the dissociation of compounds. It enables the determination of the number of moles of ions produced from a given mass of an ionic compound by accounting for the number of ions per formula unit.

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