How many atoms of iron are there in 2.5 moles of each of the...

How many atoms of iron are there in 2.5 moles of each of the following?
a. wolframite, FeWO $_{4}$
b. pyrite, $\mathrm{FeS}_{2}$
c. magnetite, $\mathrm{Fe}_{3} \mathrm{O}_{4}$
d. hematite, $\mathrm{Fe}_{2} \mathrm{O}_{3}$

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Key Concepts

Mole Concept

The mole is the fundamental SI unit used in chemistry to express amounts of a chemical substance. It serves as a bridge between the atomic scale and macroscopic scale, allowing chemists to count atoms, ions, or molecules by relating them to a well-defined quantity, typically using the number 6.022×10^23, which is Avogadro’s number.

Chemical Formulas

Chemical formulas indicate the types and numbers of atoms present in a compound. The subscripts in these formulas provide the mole ratio of the elements in the compound, which is crucial in determining the number of moles of a particular element when given a set amount of the compound.

Stoichiometry

Stoichiometry is the calculation of reactants and products in chemical reactions based on the balanced equations and the mole ratios in chemical formulas. It allows one to determine the proportional amounts of each element or compound involved in a reaction or present in a sample.

Avogadro's Number

Avogadro's number, approximately 6.022×10^23 particles per mole, is used to convert between the number of moles and the actual number of atoms, molecules, or ions. This constant is essential for linking the macroscopic measurements of a substance with the microscopic scale of individual particles.

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