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TD 3 Qcm 7


Mogui32

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Bonsoir,

 

Je ne comprends pas les items D et E de ce QCM :

 

Voici la correction que j'avais marqué :

 

D. Variation moyenne d'enthalpie correspondant à la rupture d'une liaison hydrogène : Δr H ° (LH) = (+28+42)/5 = +14

 

E. Variation moyenne d'entropie correspondant à la formation d'une liaison hydrogène : Δr H ° (LH) = (-75-110)/5 = -37

 

Voilà je ne comprends pas pourquoi on divise tout par 5 ..

 

Merci d'avance

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