How many particles are in one mole of a substance?

The correct answer is that there are 6.02 x 10^23 particles in one mole of a substance, which is known as Avogadro's number. This constant is fundamental in chemistry as it allows scientists to convert between the number of atoms, molecules, or particles and the amount of substance in moles.

Avogadro's number is a fixed quantity that represents the number of particles in one mole of any substance, reflecting a standard measurement that can be applied universally to all materials. This means that whether you’re dealing with a mole of carbon atoms, oxygen molecules, or any other substance, it will always equate to approximately 6.02 x 10^23 particles.

This is an essential concept in stoichiometry, allowing chemists to relate mass and particle count to chemical reactions and formulations. Understanding the importance of Avogadro's number is vital for performing calculations in chemical equations, determining molar masses, and making solutions in laboratory settings.

The other numbers provided do not correspond to Avogadro's number and are therefore not used in standard scientific calculations regarding moles in chemistry.