Stoichiometry
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What is relative atomic mass?
the average mass of the isotopes of an element compared to 1/12th of the mass of an atom of carbon-12
What is Ar?
relative atomic mass
Relative atomic mass can be written as…
Ar
What is relative molecular mass?
the sum of the relative atomic masses
What is Mr?
relative molecular mass
Relative molecular mass can be written as…
Mr
What is the mole?
the unit of amount of substance
How many particles are in one mole?
6.02 × 10^23
What is the Avogadro constant?
6.02 × 10ˆ23: the number of particles in one mole
One mole contains 6.02 × 10ˆ23 _____.
particles- includes atoms, ions, molecules…
moles =
mass/molar mass
What is an empirical formula?
the simplest whole number ratio of the different atoms or ions in a compound
What is a molecular formula?
as the number and type of different atoms in one molecule
volume of gas at r.t.p =
moles x 24 answer in dmˆ3
What is concentration measured in?
g /dm3 or mol/dm3
Formula for calculation volumes and concentrations
n = c x v moles = conc x vol
How can you convert concentrations from mol/dm3 to g/dm3?
multiplying the concentration in mol/dm3 by the Mr of the substance
formula for % composition of an element
(Ar x number of atoms / mr of compound) x100
% yield formula
(actual/theoretical) x 100
formula for % purity
(mass of pure/mass of impure) x 100