Conversion factors

Moles to particles

Particles are atoms, molecules or ions

1 mole = Avagadro’s number of particles

1 mole___ or 6.022 x 1023

6.022 x 1023 1 mole

Moles to grams

1 mole = 1 molar mass (grams) of a substance

1 mole_____ or molar mass(g) Molar mass (g) 1 mole

Which conversion factor do you use?

• You want the units to cancel out.

• Start with the unit given in the problem.

• End with the unit asked for in the problem.

• Use the conversion factor that will cancel out what you don’t need and leave what you do need.

Examples: