Question

Qual a massa molecular dos compostos: a) C5H5OH b) C2H6 c ) NO2 d) Ca (OH)2 e) Na2SO4 x 3 H20

Answer 1

C = 12

H = 1

O = 16

N = 14

Ca = 40

S = 32

Na = 23

 

a)

12x5 + 1x5 + 16 + 1 = 82g

 

b)

12x2 + 1x6 = 30g

 

c)

14 + 16x2 = 46g

 

d)

40 + (16 + 1) x 2 =  74g

 

e)

23x2 + 32 + 16x4 = 142g

(1x2 + 16) x 3 = 18 x 3 = 54g

142 x 54 = 7668g