Stoichiometry Flashcards
Relative atomic mass (Ar)
The average mass of atoms
Relative formula mass (Mr)
The sum of all the relative atomic masses shown of all the elements shown in the formula
Define mole
The amount of substance that contains 6x10^23 atoms,ions or molecules.
Equation for finding mass
no. of moles= mass/Mr
Equation to find volume and concentration
Moles= Conc. x Volume
Concentration unit
mol/dm cube
Volume unit
dm^3
How to convert from cm^3 to dm^3
divide by 1000
Avogadro’s constant
6.02x10^23
Equation to find the volume of a gas
Volume=Moles/24
Percentage yield formula
(Actual yield/ Theoretical yield) x 100
Define limiting reagent
The limiting reactant is the reactant which is not present in excess in a reaction
Percentage purity formula
(Mass of pure substance/ Mass of impure substance) x 100
