Here's why:

* Molar mass: The molar mass of an element is the mass of one mole of that element.

* Potassium (K): The molar mass of potassium is approximately 39.10 g/mol.

* Sodium (Na): The molar mass of sodium is approximately 22.99 g/mol.

Since potassium has a higher molar mass than sodium, a mole of potassium will weigh more than a mole of sodium.