The Mole Highway Your roadmap to help get from quantity to quantity! How to use this: 1. Find your starting place 2. Find your stopping place 3. Follow the roadmap! MASS (grams) Mulitply by Density to get grams! VOLUME (milliliters or mL) Divide by Density to get volume! Divide by Molecular Weight to get moles! Multiply by Molecular Weight to get grams! MOLES Divide by Avagadro's Number to get moles! # of particles Use stoichiometry from chemical equation! Multiply by Avagadro's Number to get # of particles! # of moles of reactant or product Useful Conversion Factors: Molecular Weight (MW in grams/mol) Molecular weight (also called formula weight and molar mass) - the weights of all atoms in a molecule. Read the values off the peridic chart and add them together! (You can find this every time!) Density (in grams/mL) mass per volume - that is the amount of grams that will displace 1 mL of water. Water is 1 g/mL - Any other densities will have to be given to you in the book! Avagadro's Number: 6.022 x 1023 particles in 1 mol Chemical Equation: You need this to be able to convert moles of reactant to moles of product! Always make sure your chemical equation is balanced!