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Physics, 18.02.2021 20:00 heyysiirr3064

1 Réaliser l'expérience. a. Determiner, à partir de la variation de masse de la bougie,
le nombre de molécules d'acide stéarique consommées.
b. En utilisant l'élévation de température, calculer en Joule
énergie dégagée par la combustion.
Quelle est expérimentalement l'énergie dégagée par la
combustion d'une molécule d'acide stéarique ?
2 a. Quel est le nombre de liaisons rompues dans les réac-
tifs CH 0 et 26 0,?
b. Calculer l'énergie nécessaire pour u casser » une molécule
d'acide stearique et 26 molécules de dioxygène.
Un calcul similaire permet d'établir l'énergie Eformation néces-
saire à la formation des liaisons des produits 18 CO2 et 18 H20:
Eformation=

Pourquoi ne trouve-t-on pas la même valeur ?
A quoi correspond cette différence ? La calculer

CONCLUSION
3 Expliquer la différence entre la valeur expen
rimentale de l'énergie libérée lors de la combus-
tion et celle évaluée avec les énergies de liaisons
Pourquoi ne trouve-t-on pas la même valeur ?

Données :
température eau 1 = 17.4°C
température eau 2= 49.5°C
m eau= 100g
m bougie 1= 11.54 g 1 gramme de précision
m bougie 2= 10.97 g 1 gramme de précision
​


7.52 \times {10}^{ - 17 }
1 Réaliser l'expérience. a. Determiner, à partir de la variation de masse de la bougie,le nombre

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1 Réaliser l'expérience. a. Determiner, à partir de la variation de masse de la bougie,
le nom...
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