Question

Determina el porcentaje de carbono presente en los siguientes compuestos:

a) propano, C3H8

b) acido formico, COOH

c) dioxido de carbono, CO2

d) Monoxido de carbono, CO

e) acetileno, C2H2

Answer 1

a) C3H8
Mm
C: 3 x 12 = 36 g/mol
H: 8 x 1 = 8 g/mol
``````````````````````````````
      Mm = 44 g/mol

% C
 
44 g ----- 100 %
36 g -----     x

      x = 81.81 % C

b.  H-COOH

Mm

C: 1 x 12 = 12 g/mol
H: 2 x 1 = 2 g/mol
O: 2 x 16 = 32 g/mol
``````````````````````````````
     Mm = 46 g/mol

% Carbono

46 g ---- 100 %
12 g ----   x

     x = 26.07 % C

c. CO2

C: 1 x 12 = 12 g/mol
O: 2 x 16 = 32 g/mol
````````````````````````````
         Mm = 44 g/mol

%C

44 g ---- 100 %
12 g ----     x

       x = 27.27 % C

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

%C

28 g ---- 100 %
12 g ----     x

       x = 42.86 % C

e.  C2H2
C: 2 x 12 = 24 g/mol
H: 2 x  1  = 2 g/mol
````````````````````````````
         Mm = 26 g/mol

%C

26 g ---- 100 %
24 g ----     x

       x = 92.30 % C