C6H6O2
C6H6O2 This is hydroquinone, one of several types, but I will use this one as example. 0.20 moles C6H6O2 (2 mole O/1 mole C6H6O2)(6.022 X 1023/1 mole O) = 2.4 X 1023 atoms of oxygen =====================
The formula is C6H6O2 and it is 1,3-dihydroxy benzene.
Firstly divide percentages by molar mass of that elementC65.45/12.01=5.45H5.45/1.01=5.40O29.09/16=1.82Then divide the result of the first step by the smallest answerC5.45/1.82=3H5.40/1.82=3O1.82/1.82=1Empirical Formula is C3H3OIf the molar mass is 110.1 we can divide this by our empirical formulas molar mass to get the molecular formula.so 110.1/(12.01x3+1.01x3+16)=110.1/55.06=2so the molecular formula is C6H6O2