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NH3+ O2→ NO + H2O NH3+ O2 → NO + H2O 2

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1 Exercice 1 :

1. NH3+ O2→ NO + H2O NH3+ O2 → NO + H2O 2. Fe + H3O+→ Fe2++ H2O + H2

3. Al4C3+ H2O → Al(OH)3+ CH4 4. I2+ S2O32- → S4O62-+ I- Exercice 2 :

Fe2+ + PO43- → Fe3(PO4)2 1,25 1,5

4 5 4 6

On multiplie par 4:

2 2

4 3

12 2

3 2

2

Correction exercices chapitre 17 : La transformation physique.

Ba2+ + SO42- → BaSO4 EI(mol)

EF(mol)

2,00.10-3 0

0 2.

4. Ba2+: réactif en défaut 5.

Exercice 3 :

1. 1 mole Ba2+ ↔ 137,7 g

x mole Ba2+ ↔ 0,275 g x = –––––––0,275 = 2,00.10-3mol 137,7

3.

1 mole BaSO4↔ 238,8 g

2,00.10-3mole BaSO4 ↔ x g x = 2,00.10-3x238,8 = 0,477 g 3,00.10-3

1,00.10-32,00.10-3

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