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Summary AQA A level chemistry amount of substance full revision notes
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A helpful and comprehensive set of revision notes covering the entire second unit of AQA A level chemistry- amount of substance
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Amount2.7
RELAT|VE
of Subslance
MASSES AND tHE MOLE 2.2 MOLEs IN SOLUTION
Relatiye atomc mass average mass of one atom of an element
Ar i2 masS of one 2 C at om
Relative molec ular mass : averagc mass of one molecue
Me } mass of one atom
e.g H,0 (2x) (ix 16)
18.0
Avo qadro constant- number of atom s i0 124 of carbon-12
Mole amount of substance that contains 6. O222x 1023
pactides
Ar of any element in grams is one mole of atoms
Me of any substance n grams is one mole of Cntities
Moles : mass
mass of I mole (M)
moles in 0.53 of Nag C03
(2 23)+ (1x 12) + (3 x 16) : 106
moles 0. S3 0. 00 sO mol
1o6
Concentrat1on is a measure of how much solute in solut1on ,in mol dm3
lmoldm means I mole of solute per cubie decimetec of solution.
e-g- conentrat1on of I. 174 Nad in S00m3 of solut1on
concentrohon : moles O. 020 0, 040 mol dm -3
volume 0. SO0
moles = concentration x volume
IO00
c-q moles in 25 um? of soluton with concentration of 0l moldm
moles : 0.1 25 : O. 002s mol
1000
, 2.3 THE IDEAL GAS
EaVAT ION
BOYLES LAW
Pressure Px Volume V constant when temperature constant
CHARLES LAW
Volume Voc temperature Ti - when
press ure ontant
GAY -LUSSACS LAW
Pressure Poc temperature T when volume constant
Pressure x volume constant for fixed mass of gas
Temperature
JDEAL CrAS EQUATION
For n moles of 44s
pressure x volume : moles gas constant * temperature
pV : nRT
R=8.31 JK mol
P must be in Po (Nm). Imust be in K
V: nRT P: nRT
RT
You can tund M once
you hane moles and mass.
Remember to Convert unts. o convet °c to K add 273!
Using 24 000 um' as volume of gas is not prec1se its
gas equation. neces$ary to use ideal
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