Calcule a massa molecular dos compostos

A) Ca=40

   No=(259.3).2=1,554+40=1,594

b)K=39

 Mn=55

 O=16.3+39+55= 158

c)H=2.1

  O=16.2+2=34

A) Ca[NO₃]₂

Ca = 40g x 1 = 40g
N = 14g x 2 = 28g
O = 16g x 6 = 96g

Massa molar = 164g

B) KMnO₄

K = 39g x 1 = 39g
Mn = 55g x 1 = 55g
O = 16g x 4 = 64g

Massa molar = 158g

C) H₂O₂

H = 1g x 2 = 2g
O = 16g x 2 = 32g

Massa molar = 34g