What is the relationship between mass and the mole unit?

1 Answer | Add Yours

t-nez's profile pic

t-nez | High School Teacher | (Level 3) Associate Educator

Posted on

The mole is a specific quantity, 6.02x10^23. A mole of anything will contain this number of particles, just as a dozen of anything will contain 12. The mass of a mole of particles depends on the mass of the individual particle, just as a dozen golf balls doesn't have the same mass as a dozen ping pong balls.

The molar mass of a substance is the mass of one mole of particles in grams. For example, since the molar mass of carbon is 12 g/mol, one mole of carbon atoms has a mass of 12 g. H2O has a molar mass of 18 g/mol, (2xH) + O. One mole of water molecules therefore has a mass of 18g.

The molar mass is used as a conversion factor to convert grams to moles and moles to grams, as follows:

moles x molar mass = grams

grams/molar mass = moles

We’ve answered 319,645 questions. We can answer yours, too.

Ask a question