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Module 2 Foundations in chemistry
amount of substance
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reacting quantities
chem > Module 2 Foundations in chemistry > amount of substance
3 cards
moles and volumes
chem > Module 2 Foundations in chemistry > amount of substance
23 cards
Cards (45)
Specific heat capacity, c
The
energy
required to raise the
temperature
of
1
g of a substance by
1K.
Stoichiometry
The
ratio
of the amount, in
moles
, of each
substance
in a chemical
reaction.
Water of crystallisation
Water
molecules that are
bonded
into a
crystalline
structure of a compound.
Relative atomic mass, Ar
The
weighted
mean
mass
of an atom of an
element
compared with
one-twelfth
of the
mass
of an atom of
carbon-12.
Relative formula mass
The
weighted
mean mass of the
formula
unit of a compound compared with
one-twelfth
of the mass of an atom of
carbon-12.
Relative isotopic mass
The
mass
of an
isotope
compared with
one-twelfth
of the
mass
of an
atom
of
carbon-12.
Relative molecular mass, Mr
The
weighted mean mass
of a molecule of a compound compared with
one-twelfth
of the mass of an atom of
carbon-12.
Molar mass M
The
mass
per
mole
of a substance, in units of
g mol-1
Amount of
substance
, n
The quantity whose unit is the
mole.
Chemists use amount of
substance
as a means of
counting
atoms
Atomic number Z
The number of
protons
in the nucleus of an atom (also
proton
number)
Avogadro's hypothesis
Equal
volumes of
gases
at the same
temperature
and
pressure
contain the same number of
molecules
One mole of carbon, C, atoms has a mass of
12
g
One mole of hydrogen, H, atoms has a mass of
1
g
One mole of magnesium, Mg atoms has a mass of
24.3
g
One mole of iron, Fe, atoms has a mass of
55.8
g
amount
= n
mass
= m
molar mass
= M
n =
m/M
OR moles =
mass
/
Mr
See all 45 cards