For each of the following samples of ionic substances,...

For each of the following samples of ionic substances, calculate the number of moles and mass of the positive ions present in each sample. a. 4.25 g of ammonium iodide, $\mathrm{NH}_{4} \mathrm{I}$ b. 6.31 moles of ammonium sulfide, $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{S}$ c. 9.71 $\mathrm{g}$ of barium phosphide, $\mathrm{Ba}_{3} \mathrm{P}_{2}$ d. 7.63 moles of calcium phosphate, $\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}$

For each of the following samples of ionic substances, calculate the number of moles and mass of the positive ions present in each sample.
a. 4.25 g of ammonium iodide, $\mathrm{NH}_{4} \mathrm{I}$
b. 6.31 moles of ammonium sulfide, $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{S}$
c. 9.71 $\mathrm{g}$ of barium phosphide, $\mathrm{Ba}_{3} \mathrm{P}_{2}$
d. 7.63 moles of calcium phosphate, $\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}$

Key Concepts

Mole Concept

The mole is a fundamental unit in chemistry that represents a specific number of particles, typically atoms or molecules, and serves as a bridge between the atomic scale and macroscopic measurements. It allows chemists to convert between mass and number of particles using the molar mass.

Molar Mass

Molar mass is the mass of one mole of a substance, usually expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all atoms in a chemical formula, and is essential for converting between the mass of a substance and the number of moles.

Stoichiometry

Stoichiometry involves using the quantitative relationships between reactants and products in a chemical formula or reaction. In the context of ionic compounds, it allows one to determine the number of moles of specific ions present based on the compound's formula, by understanding the ratio of ions per formula unit.

Ionic Compounds

Ionic compounds are chemical compounds composed of positive ions (cations) and negative ions (anions) held together by electrostatic forces. Their formulas provide the ratio of these ions, which is critical when calculating the amount of a particular ion in a given sample.

Positive Ions

Positive ions, or cations, are atoms or groups of atoms that have lost electrons, resulting in a net positive charge. In calculations involving ionic substances, identifying the cation and its stoichiometric contribution is key to determining its mole and mass content in the sample.

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