Calculate the mass percent composition of carbon in each the following carbon compounds.

C2H2
C3H6
C2H6
C2H6O

All of these are done alike.

(mass C/total mass)*100 = ?
For the first one;
[2*12/(2*12+2*1)]*100 =

To calculate the mass percent composition of carbon in a compound, you need to know the molar mass of carbon and the molar mass of the compound itself.

1. C2H2 (ethyne/acetylene):
The molar mass of carbon (C) is 12.01 g/mol.
The molar mass of C2H2 can be calculated as: (2 x 12.01 g/mol) + (2 x 1.01 g/mol) = 26.04 g/mol.
To find the mass percent composition of carbon in C2H2:
Mass percent of carbon = (mass of carbon / mass of compound) x 100%
= (2 x 12.01 g / 26.04 g) x 100%
≈ 92.26%

2. C3H6 (propyne):
The molar mass of carbon (C) is 12.01 g/mol.
The molar mass of C3H6 can be calculated as: (3 x 12.01 g/mol) + (6 x 1.01 g/mol) = 42.08 g/mol.
To find the mass percent composition of carbon in C3H6:
Mass percent of carbon = (mass of carbon / mass of compound) x 100%
= (3 x 12.01 g / 42.08 g) x 100%
≈ 85.26%

3. C2H6 (ethane):
The molar mass of carbon (C) is 12.01 g/mol.
The molar mass of C2H6 can be calculated as: (2 x 12.01 g/mol) + (6 x 1.01 g/mol) = 30.07 g/mol.
To find the mass percent composition of carbon in C2H6:
Mass percent of carbon = (mass of carbon / mass of compound) x 100%
= (2 x 12.01 g / 30.07 g) x 100%
≈ 79.78%

4. C2H6O (ethanol):
The molar mass of carbon (C) is 12.01 g/mol.
The molar mass of C2H6O can be calculated as: (2 x 12.01 g/mol) + (6 x 1.01 g/mol) + 16.00 g/mol = 46.07 g/mol.
To find the mass percent composition of carbon in C2H6O:
Mass percent of carbon = (mass of carbon / mass of compound) x 100%
= (2 x 12.01 g / 46.07 g) x 100%
≈ 52.03%

So, the mass percent composition of carbon in each compound is approximately:
C2H2: 92.26%
C3H6: 85.26%
C2H6: 79.78%
C2H6O: 52.03%