Dr. Stephen Lukacs (November 2013)
The key currency of chemical amounts is known as the mole. The mole is simply a constant number applied to atoms and molecules. Once you master the meaning and usage of the mole, chemistry takes on a simplicity and grace, to which any physical problem can be solved.
(November 2013) Weighing the mass of reactants or products based on the molecular formula is an important first step to knowing the amount of the substance in moles.
Be sure the carefully watch how the significant figures are calculated, using both the multiplication/division rule and then the addition/subtraction rule.
(November 2013) Moles are simply an amount of any substance. Moles are also the common ground and currency of reactants and products through balanced reactions and stoichiometry.
Now with a complete understanding of moles, you can safely move onto stoichiometry, the center of mass for chemical reactions.
(November 2013) In this PodCast, try to see that I really just keep doing the same thing over and over again. I am just applying the unit-cancellation method, over and over. Once you begin to see this, then you will begin to master these problems.