Answer
80% of Carbon.
Work Step by Step
The represented molecule is Ethane ($C_{2}H_{6}$)
1. Find the mass of $C_{2}H_{6}$:
C: 12 x 2 = 24
H: 1 x 6 = 6
24 + 6 = 30
2. Divide the mass of Carbon in the molecule by the total mass:
$\frac{24}{30}$ = 0.8
3. Multiply the result by 100%:
0.8 x 100% = 80%
