A Mole of Oxygen (O₂)molecules and a Mole of Carbon

Multiple Choice

A mole of oxygen (O₂) molecules and a mole of carbon dioxide (CO₂) molecules at the same temperature and pressure have

A) the same average molecular speeds.
B) the same number of atoms.
C) different average kinetic energy per molecule.
D) the same number of molecules.
E) different volumes.