Question

How many oxygen atoms in 9 grams of sugar?

Answer 1

Use a conversion factor.
You need the formula of sugar to solve for it.

9grams 1mol 6.022X10^23 formulaUnits
X _____ X ___________
g of sugar 1mol




...


__Formula units X atoms of oxygen
________________
1formula unit



then you get your answer in atoms of O.