General Questions
These questions are not explicitly keyed to chapter topics; many require integration of several concepts.
The density of gaseous helium at 25 °C and normal atmospheric pressure is 1.64×10-4g/mL. At the same temperature and pressure the density of argon gas is 1.63 ×10-3 g/mL. The mass of an atom of argon is almost exactly ten times the mass of an atom of helium. Provide a nanoscale explanation of why the densities differ as they do.
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