Can someone please help me and explain how to do this :') How many moles of O₂ are needed to produce 3.17 mol of carbon monoxide from it's elements by a synthesis reaction?

this is the answer explanation of previous question. as what you say in comment i do that

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.