H2 will diffuse fastest as it has the least molecular weight.
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Hydrogen (H2) will diffuse the fastest because it has the smallest molecular weight, which corresponds to higher average speeds of the gas particles at a given temperature. This allows hydrogen molecules to move more quickly through a medium compared to the heavier carbon dioxide (CO2) and methane (CH4) molecules.
CO2 (carbon dioxide) is chief among them, followed by CH4 (methane), N2O (nitrous oxide), and O3 (ozone).
The molecular equation for the combustion of methane gas (CH4) in the presence of oxygen (O2) is: CH4 + 2O2 -> CO2 + 2H2O.
Oxygen (O2) would diffuse from alveoli in the lungs into the blood, while carbon dioxide (CO2) would diffuse from the blood into the alveoli for elimination from the body during internal respiration.
The balanced equation for the reaction is: CH4 + 2O2 → CO2 + 2H2O. This balance was achieved by making sure the number of atoms of each element is the same on both sides of the equation.