Question

calcule o NOX dos elementos sublinhados a)CaCO3 b)NaHCO3 c)H4P2O5 d)O3 e)CO f) Al(ClO)3 g) SO3 2- h)CrO4 2- i)ClO2 f)AsO4 3- K)MnO4 e)B4O7 2-

Answer 1

A)

+2    -2
CaCO₃
2 + C + 3(-2) = 0
2 + C - 6 = 0
C = 6 -2 
C = +4

B)


+1 +1 -2
NaHCO₃

+1 + 1 + C + 3(-2) = 0
C+ 2 -6 = 0
C = 6 - 2
C = + 4

C)

+1     -2
H₄P₂O₅
4.1 + 2P + 5(-2)=0
4 + 2P -10 =0
2P = 10 -4
2P = 6
P = 6/2
P = +3

D) Toda substância simples o noz é igual a zero.

E)
    -2
CO
C - 2 = 0
C = +2

F)

+3     -2
Al(ClO)₃
+3 + 3Cl + 3(-2) = 0
+3 + 3Cl -6 = 0
3Cl = +6 - 2
3Cl = +3
Cl = +3/3
Cl = +1

G)
    -2
SO₃
S + 3(-2) =0
S = +6

H)

CrO₄²⁻
Cr + 4(-2) = -2
Cr -8 = -2
Cr = 8 -2
Cr = + 6

I) ClO₂
Cl + 2(-2) = 0
Cl - 4 = 0
Cl = +4

F)

AsO₄³⁻
As+ 4(-2) = -3
As -8 = -3
As = 8 -3
As = +5

K) 

+1      -2
KMnO₄
+1 + Mn + 4(-2) =0
+1 +Mn - 8 = 0
Mn = 8 -1
Mn = +7


e)

B₄O⁷ ²⁻
4B + 7(-2) = -2
4B -14 = -2
4B = 14 -2
4B = 12
B = 12/4
B = +3

Answer 2

Observe o nox dos elementos solicitados:

a)

+2    -2

CaCO₃

2 + C + 3(-2) = 0

2 + C - 6 = 0

C = 6 -2 

C = +4

b)

+1 +1 -2

NaHCO₃

+1 + 1 + C + 3(-2) = 0

C+ 2 -6 = 0

C = 6 - 2

C = + 4

c)

+1     -2

H₄P₂O₅

4.1 + 2P + 5(-2)=0

4 + 2P -10 =0

2P = 10 -4

2P = 6

P = 6/2

P = +3

d) O nox é zero para toda substância simples.

e)

   -2

CO

C - 2 = 0

C = +2

f)

+3     -2

Al(ClO)₃

+3 + 3Cl + 3(-2) = 0

+3 + 3Cl -6 = 0

3Cl = +6 - 2

3Cl = +3

Cl = +3/3

Cl = +1

g)

   -2

SO₃

S + 3(-2) =0

S = +6

h)

CrO₄²⁻

Cr + 4(-2) = -2

Cr -8 = -2

Cr = 8 -2

Cr = + 6

i) ClO₂

Cl + 2(-2) = 0

Cl - 4 = 0

Cl = +4

f)

AsO₄³⁻

As+ 4(-2) = -3

As -8 = -3

As = 8 -3

As = +5

k) 

+1      -2

KMnO₄

+1 + Mn + 4(-2) =0

+1 +Mn - 8 = 0

Mn = 8 -1

Mn = +7

e)

B₄O⁷ ²⁻

4B + 7(-2) = -2

4B -14 = -2

4B = 14 -2

4B = 12

B = 12/4

B = +3

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