Calcule a porcentagem em massa de oxigênio em cada um dos seguintes compostos: (a) SO2; (b) sulfato de sódio; (c) C2H5COOH; (d) Al(NO3)3; (e) nitrato de amônio..

Passo 1

Falaaaaaaaaaaaaaaaaaaa Tribuxo!!!!!!!

Bora resolver mais uma questão!?

Primeiro vamos usar as massas dos átomos:

H = 1,0   u

N = 14,0   u

N a = 23,0   u

C = 12,0   u

O = 16   u

S = 32,1   u

A l = 27,0   u

Passo 2

(a) S O 2 = 32,1 + 2 ⋅ 1 6 , 0   u = 6 4 , 1   u

% O = 2 ⋅ 16,0   u 64,0   u ⋅ 100 = 49,9 %

Passo 3

(b) N a 2 S O 4 = 2 ⋅ 23,0   u + 3 2 , 1   u + 4 ⋅ 16,0   u = 1 4 2 , 1   u

% O = 4 ⋅ 16,0   u 142,1   u ⋅ 100 = 4 5 %

Passo 4

(c) C 2 H 5 C O O H = 3 ⋅ 12,0   u + 6 ⋅ 1   u + 2 ⋅ 16,0   u = 74,00   u

% O = 2 ⋅ 16,0   u 7 4 , 00   u ⋅ 100 = 4 3,2 %

Passo 5

(d) A l N O 3 3 = 27,0   u + 3 ⋅ 14,0   u + 9 ⋅ 16,0   u = 213,0   u

% O = 9 ⋅ 16,0   u 213 , 0   u ⋅ 100 = 67 , 6 %

Passo 6

(e) N H 4 N O 3 = 2 ⋅ 1 4 , 0   u + 4 ⋅ 1,0   u + 3 ⋅ 16,0   u = 8 0 , 0   u

% O = 3 ⋅ 16,0   u 80 , 0   u ⋅ 100 = 6 0 %

Como foi????

Bora resolver mais uma!!!!?

Resposta

  1. 4 9,9 %
  2. 45 %
  3. 43,2 %
  4. 6 7 , 6 %
  5. 60 %