Chemistry OCR (A) F321 Revision 4 of 4

acid-base titration and moles :)

p.s. go through these notes at least once in your revision plan and you'll definitely ace your exams :D

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11/12/2011
Moles,
calcula/ons
in
gaseous
and
solu/on
and
acids
and
bases
Moles
and
calcula/ons
1

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Page 2

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Objec/ves
All
Define
rela/ve
molecular
mass
and
rela/ve
formula
mass
Most
Describe
Avogadro's
constant
and
the
terms
moles
and
molar
mass
Some
Explain
how
to
use
moles
and
molar
mass
in
calcula/ons
Rela/ve
molecular
mass
(Mr)
When
we
are
referring
to
a
compound
we
add
up
the
rela/ve
atomic
masses
to
give
the
rela/ve
molecular
mass,
Mr.…read more

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Worked
example
H2O
=
(2x1)
+
16
=
18
CH4
=
12
+
(4x1)
=
16
Where
crystals
are
concerned
the
Mr
may
also
include
water
of
crystallisa/on.
Calcula/ng
Mr
Calculate
the
Mr
of;
1. CuSO4
2. PbNO3
3. Na2CO3.…read more

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Rela/ve
formula
mass
Ionic
compounds
consist
of
metal
and
non-metal
ions
rather
than
molecules
e.g.
NaCl
is
made
up
of
Na+
and
Cl-
ions
in
a
la[ce.
It
would
not
be
correct
to
use
the
term
rela/ve
molecular
mass
as
an
NaCl
molecule
does
not
exist.
To
be
absolutely
correct
we
use
for
ionic
compounds.
(Although
in
prac/ce
Mr
is
o]en
used
for
ionic
compounds
as
well).…read more

Page 5

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Molar
mass
example
Water
molecules
have
Mr
=
18.
therefore
1
mole
of
water
has
a
mass
of
18
grams.
Calcula/ng
number
of
moles
Number
of
moles
(mol)
=
mass
(g)
molar
mass
(gmol-1)
This
equa/on
can
be
rearranged
to
calculate
mass
or
molar
mass
as
well
as
number
of
moles.
Mass
(g)
No.…read more

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Mark
scheme
AfL
­
using
whiteboards
Calculate
the
amount
in
moles
in
the
following;
1. 32.1
grams
of
sulfur
atoms
2. 50.0
grams
of
CaCO3
3. 6.35
grams
of
copper
atoms
4. 400
grams
of
NaOH
5. 69g
of
Pb
6. 5.…read more

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Page 10

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Past
paper
ques/on
Mark
scheme
10…read more

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