Question

el peso molecular de un compuesto es 99 g si su composcion centesimal es


C = 24.3%


H = 4.1%


Cl = 71.6%

Answer 1

El peso molecular de un compuesto es 99 g si su composición centesimal es C= 24.3%, H= 4.1%, CI= 71.6% Calcular fórmula molecular

1. calcular moles

C: 24.3 g / 12 g/mol = 2.02 mol

H: 4.1 g / 1 g/mol = 4.1 mol

Cl: 71.6 g / 35.45 g/mol = 2.02 mol

2. dividir entre el menor de los resultados

C: 2.02 mol / 2.02 mol = 1

H: 4.1 mol / 2.02 mol = 2

Cl: 2.02 mol / 2.02 mol = 1

3. FE: CH2Cl

4. calcular la Mm de la FE

C: 1 x 12 = 12 g/mol

H: 2 x 1 = 2 g/mol

Cl: 1 x 35.45 = 35.45 g/mol

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Mm = 49.45 g/mol

5. calcular n

n = Mm compuesto / Mm FE

n =  99 g/mol

    ``````````````````````

    49.45 g/mol

n = 2

6. FM: (CH2Cl)2 = C2H4Cl2 (1,2-dicloroetano)