Question

Cierto gas está compuesto de 42,86% de C y 57,14% O ¿Cual fórmula empírica?, si su masa molecular es = 44. Halle formula molecular

Answer 1

1. Calcular moles

C:  42.86 g / 12 g/mol = 3.571 mol
O: 57.14 g / 16 g/mol = 3.571 mol

2. dividir entre el menor de los resultados

C: 3.571 mol / 3.571 mol = 1
O: 3.571 mol / 3.571 mol = 1

3. FE: CO

4. Calcular Mm FE

C: 1 x 12 = 12 g/mol
O: 1 x 16 = 16 g/mol
````````````````````````````
          Mm = 28 g/mol

5. calcular n

n = Mm compuesto
      `````````````````````
          Mm FE

n = 44 g/mol
     ``````````````
      28 g /mol

n = 2

6. FM: (CO)2 = CO2