Finding the mass of oxygen?

How do I find the mass of oxygen in these fuels?
- MTBE
- Ethanol

Answer:
The MW of Ethanol C2H6O is (12*2)+(1*6)+(16*1)= 46.

The amount of O is 16.

Therefore the amount of O in Ethanol by mass is 16/46*100 = 35%.

Just follow the same procedure for MTBE
16 IS THE MASS OF OXYGEN
Since both molecules only have a single oxygen atom and the mass number of oxygen is 16, the mass of oxygen would be 16 units. if you want the percentage the first answer used the correct method.

Oxygen as an element is a diatomic meaning you will never find a single oxygen atom, they are too reactive. So elemental oxygen bonds to itself and is always seen as O2 with a mass number of 32. But a single atom like in your formulas has a mass number of 16.

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