Enthalpie de Fusion de la Glace
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Mesure de l'énergie nécessaire pour faire fondre la glace
Objectif
Déterminer l'enthalpie de fusion de la glace en ajoutant une masse connue de glace à de l'eau chaude et en mesurant la variation de température.
Contexte
When ice melts, it absorbs energy from its surroundings without changing temperature (latent heat). By adding ice to warm water in a calorimeter and measuring the final temperature, the enthalpy of fusion can be calculated. The accepted value is 6.01 kJ/mol (334 J/g).
Avertissements de sécurité
- Handle warm water with care
- Dry ice before weighing to avoid extra water mass
EPI requis
Matériaux
-
Ice cubes (50 g)From distilled water preferred
-
Warm water (100 mL)About 40°C
Équipement
Procédure
Add 100 mL of warm water (~40°C) to the calorimeter. Record exact temperature and mass.
Quickly dry ice cubes with paper towel and weigh them. Record mass.
Add the ice to the warm water. Stir gently until all ice melts.
Record the final equilibrium temperature.
Set up the equation: heat lost by warm water = heat to melt ice + heat to warm melted ice to final T.
Solve for ΔHfus. Convert to kJ/mol (multiply by 18.015 g/mol). Compare with 6.01 kJ/mol.
Résultats attendus
The final temperature should be around 10-15°C. Calculated ΔHfus should be approximately 280-350 J/g (accepted: 334 J/g or 6.01 kJ/mol).
Nettoyage
Pour water down the drain. Dry the calorimeter.
Détails
- Catégorie
- Thermochemistry
- Difficulté
- Beginner (Middle School)
- Durée
- 25 min
- Coût estimé
- $3,00
- Étapes
- 6
- Matériaux
- 2