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We cannot see, touch or feel atoms or molecules to determine their size, but we can count them! With the Who’s Counting? Atoms, Mass and Moles—ChemTopic™ Lab Activity, discover with a rice and beans analogy how chemists count atoms and molecules with the “counting by weighing” method. Calculate the average mass of a single rice grain or bean then used that to predict the expected mass of a much larger number of particles.