Answer: 499.2g of O2
Explanation:CO2 + O2 ---> CO2 +H20
From the equation, we know 1 mole of oxygen requires 1 mole of CO2 to react completely.
Therefore it is sure that 15.6 mole of CO2 requires 15.6 moles of O2
To convert moles of O2 to grams, we need to use the molar mass of O2
i.e. 32.00g/mol
the mass of O2 required is
15.6 moles *32.00 g/mol = 499.2g