That's close, but not quite right! Here's the breakdown:

* Molar mass is the mass of one mole of a substance. It's expressed in grams per mole (g/mol).

* Mole is a unit of measurement that represents a specific number of particles (atoms, molecules, ions, etc.). One mole contains 6.022 x 10²³ particles, known as Avogadro's number.

So, while molar mass involves the combined mass of all the particles in a mole, it's not the "total combined mass" of any substance. Instead, it's the mass of one mole of that specific substance.

Let me know if you have any other questions about molar mass or moles!