The chemical formula 2CO2 indicates that there are two molecules of carbon dioxide. Each molecule of CO2 consists of one carbon atom and two oxygen atoms. Therefore, to find the total number of oxygen atoms in 2CO2, you simply multiply the number of oxygen atoms per molecule by the number of molecules.
Since each CO2 has 2 oxygen atoms, for 2CO2 we calculate:
2 CO2 = 2 x 2 = 4 oxygen atoms
So, in total, there are 4 oxygen atoms present in the formula 2CO2.