Please enable JavaScript.
Coggle requires JavaScript to display documents.
Quantitative Chemistry - Coggle Diagram
Quantitative Chemistry
Relative Formula Mass
Mr of compound is Ar of all atoms added
% mass of element in compound
(Ar x number of atoms of that element / Mr of compound) x 100
Moles
1 Mole = 6.02 x 10^23 particles
moles = mass / Mr
1 mole of a substance = Mr in grams
Conservation of Mass
In a chemical reaction, mass is always conserved
no atoms destroyed
no atoms created
Mass increases
a reactant is gas
Before
cannot account for mass
After
when gas reacts
becomes part of contents
total mass increases
Mass decreases
a product is gas
Before
reactants contained
After
gas escapes
can’t account for mass
total mass decreases
Limiting Reactants
Excess
ensure all of other reactant is used
left over
Limiting
completely used up
Concentration Calculations
amount of solute dissolved in a volume of solvent to make a solution
Solute
being dissolved
Solvent
does the dissolving
Solution
solute + solvent
dm³
volumes in concentration
1 dm³ = 1000 cm³
1 dm³ = 1L
concentration = no. of moles / volume
mol/dm³
x Mr
g/dm³