Molar mass is the mass of one mole of a substance, and moles are the amount of a substance present. To convert molar mass to moles, divide the mass of the substance by its molar mass. The molar mass is typically given in grams per mole (g/mol), so the units of the mass must be converted to grams.

Here is the formula to convert molar mass to moles:

Moles = Mass (in grams) / Molar Mass (in g/mol)

For example, let's convert 100 grams of water to moles. The molar mass of water is 18.015 g/mol.

Moles = 100 g / 18.015 g/mol

Moles = 5.549 mol

Therefore, 100 grams of water is equal to 5.549 moles of water.