If a car produces 88 grams of co2 , how many grams of oxygen are used up in the reaction

In chemistry he have to study atoms,molecules,etc.as u know these all are very small in their size.it is very hard to mesure the mass of a singal atom so scientist developed a new system that we call mole system. 
1 mole = 6.022 * 10^23.it is like 1 dozen = 12,1 grros =144 
2).11.1 MOLE of O2 is required. 
3).69 g of O2 is used 
4).239.14 g of CO2 & 146.73 g of H2O is made.

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