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Chemie Enthalpie samenvatting
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samenvatting hoe je enthalpieoefeningen moet maken (Chemie)
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Eben RobijnsENTHALPIE SAMENVATTING
ENTHALPIE : INLEIDING
- Enthalpieverandering ∆H is de warmte die vrijkomt (of opgenomen wordt) tijdens een chemische reactie die onder
constante druk uitgevoerd wordt.
o Enthalpieverandering = reactiewarmte
o ∆H < 0 = exotherm = er komt warmte vrij
▪ A + B → C + warmte
o ∆H > 0 = endotherm = er wordt warmte opgenomen
▪ A + B + warmte → C
Berekenen enthalpieverandering:
Stel:
je hebt de reactie A + B → C en je wilt ∆H berekenen. Je weet de enthalpie-veranderingen van gegeven stoffen niet, maar je
vindt wel volgende gegevens: A+B→D+E = ∆𝐻1 en D+E→C = ∆𝐻2 (∆𝐻1 en ∆𝐻2 zijn gegeven waardes in tabel)
Dan kan je ∆H bereken als volgt:
Voorbeeld:
Opstellen enthalpiediagram:
Je wilt volgende vgl. in een diagram zetten:
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