How many moles of oxygen atoms are contained in each...

How many moles of oxygen atoms are contained in each compound?
a. 2.50 mol of KMnO $_{4}$
b. 45.9 mol of $\mathrm{CO}_{2}$
c. $1.25 \times 10^{-2}$ mol of $\mathrm{CuSO}_{4} \cdot 5 \mathrm{H}_{2} \mathrm{O}$

Key Concepts

Hydrated Compounds

Hydrated compounds include water molecules as part of their crystalline structure, indicated by a dot followed by the number of water molecules. Proper interpretation of hydrated formulas requires accounting for both the anhydrous portion and the water of hydration when counting atoms, since the water molecules contribute additional atoms to the overall composition.

Stoichiometry and Conversion Factors

Stoichiometry involves the calculation of reactants and products in a chemical reaction using the relationships expressed in the balanced equation. Conversion factors, such as the number of oxygen atoms per molecule, allow the conversion from moles of a compound to moles of individual atoms, making it possible to quantify specific elements within compounds.

Chemical Formula Interpretation

A chemical formula represents the types and numbers of atoms in a molecule or compound. Interpreting chemical formulas involves identifying the subscripts that indicate how many atoms of each element are present, which is essential for determining the total number of a specific type of atom in a given compound.

Mole Concept

The mole is a fundamental unit in chemistry used to express amounts of a chemical substance. One mole corresponds to 6.022 x 10^23 entities, whether they be atoms, molecules, ions, or formula units. This concept enables chemists to count atoms in a sample using macroscopic measurements and relate these counts to mass and volume.

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