Question

Qual a quantidade de mol em:
a) 2g de He
b) 480 g de O 2
c) 243 g HBr
Dados: He = 4g/mol; O = 16g/mol; H = 1 g/mol; Br = 80 g/mol

Answer 1

Resposta:

Aplicar

n= m÷MM onde n= nº de mols, m= massa, MM= massa molar

a) He

MM(He): 4 g/mol

n= 2 g ÷ 4 g/mol

n= 0,5 mol

b) O₂

MM(O₂): 2*16= 32 u= 32 g/mol

n= 480 g ÷ 32 g/mol

n= 15 mol

c) HBr

MM(HBr): 1 + 80= 81 u= 81 g/mol

n= 243 g ÷ 81 g/mol

n= 3