The relative atomic mass of potassium (K) is approximately 39.10. This value indicates the mass of one atom of potassium in atomic mass units (amu). Since the relative atomic mass is already in atomic mass units, it directly corresponds to the molar mass of potassium when expressed in grams per mole (g/mol).
Therefore, the molar mass of potassium is also 39.10 g/mol. This means that one mole of potassium atoms weighs 39.10 grams. The close relationship between relative atomic mass and molar mass is due to the definition of the mole in chemistry, where Avogadro’s number defines a mole as 6.022 x 10²³ entities (atoms, molecules, etc.). Hence, both values, when rounded to two decimal places, provide important information regarding the element’s mass in various chemical contexts.