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Chemistry
Paper 1
C4-quantitative chemistry
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Cards (9)
Concentration
•increased when
mass
of solute
increased
+
volume
kept the same
•decreased when
volume
of solution
increased
+
mass
kept the same
Moles equations
Mass
(g)/
Mr
,Ar
Concentration
(mol/dm³) × volume (
dm³
)
Reasons for not achieving 100% yield
Some product lost when
separated
from
reaction mixture
Some reactants may react
differently
to
expected
so different
products
Reversible
reactions
may not go to
completion
Percentage yield
Actual
mass/maximum
theoretical
mass ×
100
Why atom economy is important
Saves
money
- minimises
waste
Increases
sustainability
- by not
wasting
Percentage atom economy
Mr of
desired
product/sum of Mr's of
reactants
×
100
1 mole of gas
Volume of
24dm³
@ room temp =
20°c
@ room pressure =
1 atmosphere
Volume of gas (dm³)
Moles
×
24
Avogadro's constant
6.02
×
10²³