The Mole Unit 3

Counting things… A term for a certain number of something. Brainstorm other counting words! Dozen = Pair = Gross = A “mole” of something is 6.02 x 1023 of something. 602, 000, 000, 000, 000, 000, 000, 000 12 2 144

The Mole Mole: The amount of a substance that has the same number of atoms as 12 grams of the carbon-12 isotope. Avogadro’s number: 6.022 x 1023; The number of atoms in 12 grams of carbon-12. Formula Weight is the mass in amu of 1 particle of a substance. It is numerically the same as the molar mass. The mass of one mole of carbon-12 is 12 grams. There are 6.022 x 1023 atoms in one mole of carbon-12.

Particles Atoms for Elements Examples: Fe, Hg, Ne, K, C Molecules for Covalent Compounds or Elements that exist in nature as molecules Examples: CH4, C3H8OH, F2, SO3 Ions for Ions Examples: Na1+, S2-, PO43- Formula Units for Ionic Compounds Examples: NaCl, K2SO3, Fe2O3

Molar Mass The atomic weight on the periodic table is numerically the same as the molar mass. Molar Mass: the mass of one mole of a substance. H2O H: 2 x 1.01 g/mol = 2.02 g/mol O: 1 x 16.00 g/mol = 16.00 g/mol 2.02 g/mol + 16.00 g/mol = 18.02 g/mol