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Argon is a gas, so it depends on temperature and pressure. At standard temperature and pressure, 1 mole of ideal gas takes up 22.4 liters, which is 22400 cubic centimeters. There are 6.023 x 10^23 atoms in 1 mole. So dividing gives 2.69 x 10^19 atoms per cm³ at standard temperature & pressure (1 atmosphere & 0° C)

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12y ago

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