CHM135H1 Chapter 3: CHM135 Chapter 3

• School: UTSG
• Department: Chemistry
• Course: CHM135H1
• Professor: Jessica D' Eon

Document Summary

3. 3 chemical arithmetic: stoichiometry: you must convert a number ratio of reactant molecules into a mass ratio when looking for the amount of reactants, mass ratios are determined by using the molecular weights of the substances involved in a reaction o molecular weight sum of atomic weights of all atoms in a molecule, formula weight sum of atomic weights of all atoms in a formula unit of any compound, molecular or ionic. 3. 5 reactions with limiting amounts of reactants: the extent to which a chemical reaction takes place depends on the reactant that is present in limiting amount (limiting reactant) while the other reactant is said to be the excess reactant, limiting reactant can be determined by comparing the amount of product formed from each reactant, the limiting reactant will form the lowest amount of product which is the theoretical yield.