How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen?

A mole of any substance contains the same number of particles: Avogadro’s number, about 6.02 × 10²³. Therefore, 1 mol of oxygen and 1 mol of nitrogen contain the same number of molecules, even though their molecules have different masses. The correct choice is “Each sample has the same number of molecules.”

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