Final answer:
1 mole of a substance is equal to its molecular weight, which is the molar mass expressed in grams. Molar mass allows for conversions between mass and number of moles, using Avogadro's number for particle counts.
Step-by-step explanation:
1 mole of a given substance is equal to the molecular weight of that substance when expressed in grams. The molecular weight, also known as molar mass, is the mass in grams of 1 mole of that substance, which corresponds to Avogadro's number of atoms or molecules. The concept of the mole is crucial in stoichiometric calculations, as it provides a bridge between the microscopic world of atoms and molecules and macroscopic quantities that can be measured in the laboratory.
The molar mass of any substance can be found by taking its atomic mass, molecular mass, or formula mass and expressing it in grams per mole. This molar mass allows chemists to convert between the mass of a substance and the number of moles. Avogadro's number, which is 6.02×1023 particles per mole, is used to determine the number of particles in a given number of moles of a substance.