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5. Un recipient en metal a un volume fixe de 100 Let contient un gaz parfait a temperature et pression ambiante (20C et 1 atm).

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5. Un recipient en metal a un volume fixe de 100 Let contient un gaz parfait a temperature et pression ambiante (20C et 1 atm). On ferme le recipient hermetiquement et on le chauffe jusqu'a ce que sa temperature (ainsi que la temperature du gaz a l'interieur) soit egale a 100 C. Utilisez PV = nRT. a) Quelle est la nouvelle pression du gaz a l'interieur? b) Combien de moles de gaz doit-on immediatement laisser echapper (par exemple par une petite valve) pour faire revenir la pression a 1 atm? c) Apres avoir evacue le gaz pour obtenir une pression de 1 atm, on referme la valve et on le refroidir a 0C. Quelle est alors la pression dans la cuve

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