Carbon dioxide (co2) is a gaseous compound. calculate the percent composition of this compound. answer using three significant figures. what is the percent by mass of carbon? %

Carbon dioxide is a gaseous molecule made up of the elements, C and O. Each mole of carbon dioxide has one mole C and two mole oxygen atoms.

Molar mass of carbon dioxide ()=

Percentage by mass of carbon =

Percentage by mass of oxygen =

Therefore C is 27.3 % and O is 72.7 % by mass in 1 mol CO

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.