Determina el porcentaje de carbono presente en los siguientes compuestos :a) propano, C3H8b) acido formico, COOHc) dioxido de carbono, CO2d) Monoxido de carbono, COe) acetileno, C2H2?

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.