Question

Cálcule qual a massa de :

a)5 mol de HCl

b)7 mol de Mg(OH)2

c)0,5 mol de NaOH

d)15 mol de HNO3

Answer 1

a) H = 1   Cl = 35

35 + 1 = 36

1 mol ------  36 g/mol

5 mols ------ x

x = 180 g

 

b) Mg = 24  O = 16  H = 1

24 + (16 +1)x2 = 58

1 mol ------ 58 g/mol

7 mols ------ x

x = 406 g

 

c) Na = 23   O = 16   H = 1

23 + 1 + 16 = 40

    1 mol ----- 40 g/mol

0,5 mols ----- x

x = 20 g

 

d) H = 1  N = 14  O = 16

1 + 14 + 16x3 = 63

    1 mol ----- 63 g/mol

15 mols ----- x

x = 945 g