Equal Volumes of Methane, Ammonia, Chlorine, and Hydrogen Are Kept

Equal volumes of methane, ammonia, chlorine, and hydrogen are kept at the same temperature and pressure. Which of the following is true of the gases?

A) All the gases will have the same mass.
B) Hydrogen having the lowest molecular weight will be present in greater quantity.
C) The amount of methane and ammonia will be double that of hydrogen and nitrogen since they have twice the number of atoms.
D) Since equal volumes of the gases are present at the same conditions the number of moles of the gases will be the same.
E) Chlorine and hydrogen being non-polar will have least intermolecular attraction, hence fewer number of moles of these gases will be present.