Question

Un compuesto de masa molar 98.0g esta constituido por 24.49% de carbono, 4.08% de hidrogeno y 72.43% de cloro. ¿Determine la formula molecular?.​

Answer 1

1. calcular moles

C: 24.49 g / 12 g/mol = 2.040 mol

H: 4.08 g / 1 g/mol = 4.08 mol

Cl: 72.43 g / 35.5 g/mol = 2.040 mol

2. dividi entre el menor de los resultados

C: 2.040 mol / 2.040 mol = 1

H: 4.08 mol / 2.040 mol = 2

Cl: 2.040 mol / 2.040 mol = 1

3. Fórmula empírica: CH2Cl

4. Calcular Mm de la fórmula empírica

C: 1 x 12 = 12 g/mol

H: 1 x 2 = 2 g/mol

Cl: 1 x 35.5 = 35.5 g/mol

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Mm = 49.5 g/mol

5. calcular n = Mm compuesto / Mm Fórmula empírica

n = 98 g/mol / 49.5 g/mol

n = 2

6. Fórmula molecular: (CH2Cl)2 = C2H4Cl2