Bonjour, j'aimerai savoir la réponse svp Le volume d'une salle de classe est de 180 000 L. Les volumes de gaz constituant l'air dans cette salle sont : a) 54 000 L de dioxygène et 126 000 L de diazote b) 72 000 L de dioxygène et 108 000 L de diazote c) 36 000 L de dioxygène et 144 000 L de diazote Merci

Question

Grade: Education Subject: physique-chimie

Bonjour, j'aimerai savoir la réponse svp
Le volume d'une salle de classe est de 180 000 L.

Les volumes de gaz constituant l'air dans cette salle sont :

a) 54 000 L de dioxygène et 126 000 L de diazote

b) 72 000 L de dioxygène et 108 000 L de diazote

c) 36 000 L de dioxygène et 144 000 L de diazote

Merci

Asked by: USER4193

376 Viewed 376 Answers

Answer (376)

USER1895

Best Answer

(169)

Bonjour,

l'air contient environ 20% de dioxygène et 80% de diazote

Donc :

V(O₂) = 180000 x 20% = 36 000 L

V(N₂) = 180000 x 80% = 144 000 L

Answered on 26 Agustus 2025

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