masses and moles Flashcards
what is a mole
the unit for amount of substance measured in g/mol
6.02 x 10 to the power of 23
what is the equation for the number of moles
number of moles = mass of substance in grams (g) / molar mass (g/mol)
what is the equation for moles that involves concentration
moles = concentration x volume (dm cubed)
what is H2S04
sulphuric acid
what is HN03
nitric acid
what is NaOH
sodium hydroxide
what is Ar
relative atomic mass. carbon has a mass of exactly 12 units
what is Mr.
molecular mass. the sum of the relative atomic masses of all the atoms in a molecule
what is a limiting reactant
the reactant that is not in excess
what is the equation for percentage purity
mass of a pure substance / mass of impure substance x 100
what is titration
a method for finding out the amount of moles in a solution of unknown concentration usually using a burette and indicator
