0.5 mole of nitrogen gas and 0.5 mole of carbon monoxide gas at STP have same_____________?

Explanation

Each sample contains 0.5 mol of molecules, so both have 0.5 x 6.022 x 10^23 = 3.011 x 10^23 molecules. Nitrogen gas gives 0.5 mol x 2 = 1.0 mol of atoms, and carbon monoxide also gives 0.5 mol x 2 = 1.0 mol of atoms, or 6.022 x 10^23 atoms in each sample. Their masses are also equal: 0.5 mol x 28 g mol^-1 = 14 g for N2 and 0.5 mol x 28 g mol^-1 = 14 g for CO.