Summary Quantitative chemistry

Quantitative Chemistry Polyatomic ions:


The mole : NH4" Ammonium
- COs- -

Carbonate
H30" Hydronium
-
HCOz" -



Hydrogen carbonate

Mole -
>
The SI unit for ammount of substance CrOs" -Chlorate SO Sulphate
-




-
I mole contains Avrogadro's number of particles C2HyO" -
Ethanoate HSO4" Hydrogen Sulphate
-




OH" -


Hydroxide 520z2 -Thioselphate
NOs" Nitrate SOz" Sulphite
N : Molecules Mor
-
-




n
=
NA N-Number of Noz" Nitrite po , -- Phosphate
particles
-




ー 2

MnO"- Permanganete CrzQ-Dichromate

Calculate the number of molecules in 6 moles of CO2



n = 者
N = n NA

= 6x6 , 02x1023

=
3, 6x1024 molecules



Molar mass :




Molar mass-"The in of mole of that substance
mass
grams one




Calculate the molar mass of CaCOs



"
Molar 40 + 12 + 3(16) mol
mass
100g
= =
.




역 molesmassrago
n =
R 1- Molar mass
(y mol-1)
.




Calculate the number in of sodium Chloride
of moles 50y

n = 얽
35 , 5」


, 85not
=
0




concentration:



Concentration -
"The ammount of solute unit volume of solution
per

Solution -
A homogenous mixture of solute and solvent


Solute-"The substance that is dissolved in the solution


Solvent The substance in which another substance is dissolved
, forming a solution

-

An is in which water is
present
aqueousage one




C -

Concentration (mol . dm-3)

= * on c= n -
mol 1r = 1dm3
v - volume sam3)



calculate of mol dm's NaCe solution
the moles solute
particle in 30 me of a 0
,4 .




c =
้

0.4 = G
n = 0
,
012 mol




二