Question

Stabiliti coeficientii in urmatoarele ecuatii,prin bilant electronic si bilant atomic:
a) S+HNO3-->SO2+NO+H2O
b) KClO3+C-->KCl+CO2
URGEENT! Dau coronita ^^

Answer 1

a) 3S⁰ + 4H⁺¹N⁺⁵O₃⁻² ⇒ 3S⁺⁴O₂⁻² + 4N⁺²O⁻² + 2H₂⁺¹O⁻²

S⁰ -4e⁻ => S⁺⁴      se oxideaza (ag.red)      ||3
N⁺⁵ +3e⁻ => N⁺²   se reduce (ag.ox)           ||4

b) 2K⁺¹Cl⁺⁵O₃⁻² + 3C⁰ ⇒ 2K⁺¹Cl⁻¹ + 3C⁺⁴O₂⁻²

Cl⁺⁵ +6e⁻ ⇒ Cl⁻¹    se reduce (agent oxidant)              ||4||2
C⁰ -4e⁻ ⇒ C⁺⁴        se oxideaza (agent reducator)       ||6||3