Question

Calcule o nox das substâncias destas reações a) N 2 + H 2 → NH 3 . b) Cl 2 + NaI → NaCl + I 2 . c) Fe + HCl → FeCl 2 + H 2 . d) C 2 H 6 O + O 2 → CO 2 + H 2 O. e) Na 2 O + HCl → NaCl + H 2 O. f) H 2 SO 4 + Ba(OH) 2 → H 2 O + BaSO 4

Answer 1

Resposta:

a)N2= zero ; H2= zero ;

NH3

H +1

+1×3= +3

N= -3

Explicação:

b) Cl2= zero; I2= zero

NaI

Na+1

I-1

NaCl

Na+1

Cl -1

c) Fe = zero. H2= zero

HCl

H+1. Cl -1

FeCl2

Cl-1

-1×2= -2

Fe+2

d)O2= zero

C2H6O

O-2

H+1

+1×6=+6

+6-2=+4

C= -4

H2O

O-2

H+1×2=+2

CO2

O-2

-2×2=-4

C=+4

e)Na2O

O-2

Na+1

+1×2=+2

HCl

H+1

Cl-1

NaCl

Na+1

Cl-1

H2O

O -2

H+1

+1×2= +2

f)H2SO4

O -2

-2×4= -8

H +1

+1×2= +2

-8+2=-6

S=+6

Ba(OH)2

O-2

-2×2= -4

H+1

+1×2= +2

-4+2=-2

Ba=+2

H2O

O-2

H+1

+1×2=+2

BaSO4

O-2

-2×4=-8

Ba+2

-8+2= -6

S=+6