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Final answer:The estimate of the number of electrons in the human body can be calculated based on the mass of the body. Since most atoms in the body have an equal number of electrons, protons, and neutrons, the number of electrons would be approximately equal to the atomic mass unit (amu).Explanation:The mass of an atom is determined by the number of protons and neutrons in its nucleus. Electrons, which have a much smaller mass, do not contribute significantly to the overall mass of an atom. Since atoms are electrically neutral, the number of electrons is equal to the number of protons.Given that most atoms in the human body have an equal number of electrons, protons, and neutrons, we can calculate an estimate of the number of electrons in the body based on the mass. Assuming a mass of 70 kg, we can use the atomic mass unit (amu) to estimate:Mass of 70 kg ≈ 6.022 × 10^23 amu (Avogadro's number)Since the mass of an electron is negligible compared to an amu, we can approximate that the number of electrons in the body would be approximately equal to the number of amu:Number of electrons ≈ 6.022 × 10^23...