What mass of oxygen forms from 71.89 g CO2?

(This is not a guaranteed correct answer)

Amount of CO2:

= 71.89 / 12.0 + 2 (16.0)

= 1.6339mol

Mole ratio can be represented as:

CO2 = 2O

Amount of O2:

= 1.6339 x 2

= 3.2677mol

Mass of O2:

= 3.2677 x 2 (16.0)

= 105g (3sf)