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Summary A Level Chemistry Topic 2 (AQA)

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Topic 2 - Amount of Substance Notes

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, calculation
AVAGADRO 'S G. Hulot EMPIRICAL ,


CONSTANT ( +1-1.01-1 FORMULA
number of atoms simplest possible integer ratio of
in one mole . atoms present in the compound
"

6. 022×10 Divide $ divide each
bmulh.my if
mass
by Ar
(atomic man)
answer
smallest
by aren't whole
numbers
no .




PERCENT

absolute
.t #-GFUNCERTANTYPV--aPT1DE.ALGAS0dm3x1Ooo=ms
total
uncertainty #
man
0cm 100000 _- m3
}

EQUATION
OMDA ✗ 1000000Pa
okpa ✗ 1000 Pa _- 0%+273 K -



✗ 100 =
percentage or _- 8.31
uncertainty
TITRATION
ATOM
25cm > sulphuric acid
ECONOMY of 0.020 moldni
>



18.6cm >
neutralise
of sodium
hydroxide
mass of HzSOq +2Na0Hm→NqSQ¥2HzQ
100
,
desired ✗ 2 :|
products conc of NaOH :


0-020×1%0=0--0-0005
.




atom n=cv=
=
economy
Naott-cv-2ntkso.io -001
PERCENTAGE
c=F= =
0-538 moldms
YIELD
Mr = 23+16+1=40 m=nxMr
actual -0-538×40
✗ 100
Geld =2l5_
theoretical
ylild =
percentage
yeild

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