What is the mass percentage of O in C₂H₆O₂? Provide an answer to two decimal places.

51.61% of O in C₂H₆O₂

Explanation:

First find the total mass: C = 12 , H = 1 , O = 16

total mass of C₂H₆O₂ = 12 * 2 + 1 * 6 + 16 * 2 = 62

so total mass of oxygen, O₂ in this is: 16 * 2 = 32

⇒ ( 32 / 62 ) * 100

⇒ 51.61%

i do not get it   at all