C4 Flashcards
Relative atomic mass, Ar
average mass of naturally occurring atoms of an element on a scale where the 12-carbon atom has a mass of exactly 12 units
Define relative molecular mass, Mr
the sum of the relative atomic masses (relative formula mass or Mr will be used for ionic compounds)
Avogadro’s number
-A mole contains 6.02 x 10^23 particles
-One mole of any substance contains this amount
Molar mass
-is the mass of one mole
-same as relative atomic mass for elements
- sum of the relative atomic masses for the formula for compounds
- add symbol for grams per mole
Limiting reactants
reactants that is used up first is the limiting reactant. The amount of products is directly proportionate to the amount of limiting reactant