\textMolar mass is the mass of one mole of a substance, typically measured in grams per mole (g/mol). It represents the total mass of all the atoms in a molecule, calculated by adding the atomic masses of each element present in the compound. For example, the molar mass of water \text(H_2\textO) is approximately 18 g/mol, derived from 2 hydrogen atoms and 1 oxygen atom. Molar mass is essential in chemistry for converting between grams and moles, allowing scientists to quantify substances in reactions. It helps in stoichiometry, which involves calculating the relationships between reactants and products in chemical equations. Understanding molar mass is crucial for accurate measurements in laboratory experiments.