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Avogadro’s mole number, 6.02 × 1023, is huge! Help clarify the concept of the mole by showing your students 6.02 × 1023 atoms of four different elements. Students will quickly grasp the ideas of mass, moles and molar mass when they compare these four specimens side by side. The included precision-cut metal bars are also great for measurement, density or specific heat experiments. Element specimens are copper, iron, zinc and aluminum.