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Samenvatting Scheikunde Havo 4 Overzicht chemisch rekenen en mol
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Een overzicht met formules en een stappen schema om allerlei scheikundige berekeningen te maken.
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Chemisch Rekenen:Massagetal = aantal protonen (atoomnummer) + aantal neutronen (vaak al genoemd)
Atoommassa in u – staat in tabel 25A Isotopen (Binas)
In gram = u x 1,67.10-24 gr (tabel 5 Binas atomaire massa-eenheid in KG (x 1000 = grammen))
Massa in gram per proton of neutron
Gemiddelde atoommassa = (rela eve atoommassa per massagetal x voorkomen in natuur) : 100
Molecuulmassa = per verschillend molecuul (aantal moleculen x rela eve atoommassa) (periodiek systeem)
Massapercentage = Molecuulmassa molecuul / Totale molecuulmassa X 100%
Rekenen met mol:
In mol-verhouding staan aantal mol
p= dichtheid (Binas T 8, 9, 10)
vaste stoffen/vloeistoffen in 103kg/m3 is hetzelfde als g/ml of g/cm3
gassen in kg/m3 is hetzelfde als g/L
M= Mol Massa, gram per mol (Binas T 98 en 99)
NA = Deeltjes per mol, constante van Avogadro 6,022x1023
V= Volume (liter)
Vm = Molair Volume (dm3 per mol) (Binas T 7)
volume procent: aantal mL stof/totaal aantal mL x 100 %
massa procent: aantal gram stof/totaal aantal gram x 100 %
ppm: parts per million, wordt meestal gebruikt bij kleine gehaltes (in plaats van %)
massa-ppm: aantal gram stof/totaal aantal gram x 106
volume-ppm: aantal mL stof/totaal aantal mL x 106
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