Question

Which of the following statements is alwaystrue?

		One mole of carbon atoms has the same mass as one mole of oxygenatoms.
		One mole of aluminum atoms has the same number of atoms as onemole of sodium atoms.
		One mole of solid iron atoms has the same number of protons asone mole of solid carbon atoms.
		One mole of oxygen atoms has the same number of electrons as onemole of calcium atoms.
		One mole of fluorine atoms has the same density as one mole ofnitrogen atoms.