2 Mole (mol) SI base unit used to measure the amount of a substance One (1) mole of anything is 6.02 X 1023Compare to other counting units:Pair = 2Dozen = 12Gross = 144Ream = 500Mole = 6.02 X 1023
3 Math Practice How many gloves are there in 8 prs? How many roses in 2.5 doz?How many atoms in 0.5 mol?
4 Avogadro’s Number is 6.02 X 1023Amedeo Avogadro determined the volume of one mol of gas
5 Molar Mass The mass in grams of one mole of any pure substance Numerically equal to its atomic mass (amu) but, has the units g/molExample:An atom of manganese has a mass of amuA molar mass = 1 mol of manganese54.94 g of Mn contains 6.02 X 1023 atoms of Mn
6 Molar Mass Ionic Compounds Use the formula mass Example: Sodium ChlorideA mole of sodium has mass = gA mole of chloride ions has mass = gOne mole of NaCl = gOr, the molar mass of NaCl is g/mol