Question

calcular formula empirica de la urea porfa 

Answer 1

fórmula de la urea: CO(NH2)2

1. calcular Mm de la urea

C: 1 x 12 = 12 g/mol

O: 1 x 16 = 16 g/mol

N: 2 x 14 = 28 g/mol

H: 4 x 1 = 4 g/mol

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         Mm = 60 g/mol

2. calcular la composición centesimal de cada elemento

%C: (1 x 12 / 60) x 100 = 20 %

%O: ( 1 x 16 / 60) x 100 = 26.67 %

%N: (2 x 14 / 60) x 100 = 46.67 %

%H: ( 4 x 1 / 60) x 100 = 6.67 %

3. calcular moles de cada elemento

C: 20 g / 12 g/mol = 1.67

O: 26.67 g / 16 g/mol = 1.67

N: 46.67 g/ 14 g/mol = 3.33

H: 6.67 mol / 1g/ mol = 6.67

4. dividir entre el menor de los resultados ( 1.67)

C: 1 .67 mol / 1.67 mol = 1

O: 1 .67 mol / 1.67 mol = 1

N: 3.33 mol / 0.67 mol = 2

H: 6.67 mol / 1.67 mol = 4

5. FE: CON2H4 = CO(NH2)2