Rekenwerk uit de hoofdstukken 3, 4 en 5: 'Moleculaire stoffen', 'Zouten en zoutoplossingen' en 'Reacties van zouten' uit Chemie Overal Scheikunde voor vwo 4.
ρ (rho) = dichtheid [kg/m3]
M = molecuulmassa/molaire massa [g/mol] (zie tabel 98)
NA = getal van avogadro [6,022…*1023/mol] (zie tabel 7)
Vm = molair volume [m3/mol] (zie tabel 7)
V = volume [L]
Algemene notes:
Veel is te doen met ‘common sense’, kijk goed naar de eenheden en vaak kun
je dan daarmee al achterhalen welke stap je moet ondernemen.
Let op of de eenheden waarmee je rekent overeenkomen, eerst omzetten dus.
o 1 L = 1 dm3; 1 mL = 1 cm3
Reactievergelijkingen of iets in die geest staan altijd in molverhoudingen:
o Eén mol moet je zien als één ‘pakketje’ van 6,022…*10 23 deeltjes.
o NaCl(s) Na+(aq) + Cl-(aq)
Eén pakketje NaCl, wordt omgezet in één pakketje natriumionen
en één pakketje chlorideionen. Allemaal pakketjes bestaan uit
hetzelfde aantal deeltjes.
o AlCl3(s) Al3+(aq) + 3 Cl-(aq)
1 mol AlCl3, wordt omgezet in 1 mol Al-ionen en 3 mol Cl-ionen.\
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