Parmi les échantillons de matière suivants, quel est celui...

Parmi les échantillons de matière suivants, quel est celui qui contient le plus grand nombre d'atomes?
a) $1 \mathrm{~g}$ de zinc
c) $1 \mathrm{~g}$ d'hélium
b) $1 \mathrm{~g}$ d'ammoniac $\mathrm{NH}_3$
d) $1 \mathrm{~g}$ de benzène $\mathrm{C}_6 \mathrm{H}_6$

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Key Concepts

Avogadro's Constant

Avogadro's Constant is the number 6.022×10^23, which defines the number of atoms, molecules, or other elementary entities in one mole of substance. This constant acts as a bridge between the atomic scale and macroscopic masses, allowing chemists to count individual atoms or molecules in measurable amounts of material.

Mole

The mole is a unit in chemistry that represents a specific number of particles, exactly 6.022×10^23. It is a fundamental concept used to express amounts of a chemical substance, facilitating the conversion between the mass of a substance and its number of atoms or molecules.

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is crucial for converting between the mass of a given sample and the number of moles it contains, which in turn allows the determination of the total number of atoms or molecules present.

Molecular Composition

Molecular composition refers to the structure of molecules, including the number and types of atoms contained in each molecule. Understanding the composition is important because compounds with larger and more complex molecules may contain several atoms per molecule, influencing the total atom count in a given mass of substance.

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