Question

Number of mole of CO2 which contain 8g of O2??

Answer 1

8 g of Oxygen O2 contains = 8/16 = 0.5 mole

2 moles of oxygen are present in 1 mole of CO2 that is,
1 mole of CO2  contains 2 moles of oxygen therefore,

x moles of CO2 contains 0.5 mole of oxygen

 X moles of CO2 = 0.5/2 =0.25 mole

Hence 0.25 mole of CO2 contains 8 g of O2