What is Avogadro's number?

Avogadro's number, which is 6.022 x 10^23, represents the number of particles (usually atoms or molecules) in one mole of a substance. This fundamental constant is crucial in chemistry because it allows chemists to convert between the number of moles and the number of individual particles, facilitating calculations in stoichiometry and various chemical reactions.

This number helps define the relationship between the macroscopic scale (moles) and the microscopic scale (individual atoms or molecules). Thus, when discussing quantities in chemical reactions, understanding and using Avogadro's number is essential for accurate measurement and interpretation of results.

The other values provided do not pertain to Avogadro's number or its significance in chemical calculations. For example, 1.6 x 10^19 is related to the number of electrons in certain contexts, 9.11 x 10^-31 refers to the mass of an electron, and 3.00 x 10^8 is the speed of light in a vacuum. These constants are important in their respective fields but are not applicable to representations of particle count in moles.