How many grams of Oxygen are in 152.21grams of CO2?

The answer is 110.67 grams of oxygen.

First convert grams CO2 to moles CO2:
152.21 g CO2 x ( 1 mol CO2 / 44.0095 g CO2 ) = 3.4586 mol CO2
(44.0095 g CO2 used since that is its molar mass found by adding the atomic mass of each element in the compound)

Then convert mol CO2 to mol O:
3.4585 mol CO2 x ( 2 mol O2 / 1 mol CO2 ) = 6.9171 mol O since there are 2 O's in each CO2

Finally convert moles O to grams O:
6.9171 mol O x ( 15.999 g O / 1 mol O ) = 110.67 g O

(32/44) X 152.21 <<< use a calculator