Mol of CO2 are produced.
When 2.5 mol of O2 are consumed in their reaction,

Well to my expert knowledge and my exquisite calculations i think the the negative ion # 412 is the key to sucess

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom

Fine out your self ponk