Question

el proileno tiene masa molecular de 42 g y contiene 14,3% de hidrogeno y 85,7% de carbono determinar la formula molecular

Answer 1

Mm H = 1 g/mol
Mm C = 12 g/mol

C: 85.7 g/ 12 g/mol = 7.14 mol
H: 14.3 g / 1g/mol =  14.3 mol

Dividir cada elemento entre el menor

C: 7.14 mol / 7.14 mol = 1
H: 14.3 mol / 7.14 mol = 2

F.  Empirica: (C₁H₂)n = CH₂
Masa molecular de la  FE
C: 1 x 12 g = 12 g/mol
H: 2 x1 g = 2 g/mol
Mm FE = 14 g/mol

n = 42 g/mol / 14 g/mol = 3

FM = (C₁H₂)n = (C₁H₂)₃

FM = C₃H₆