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The temperature of 2.00 moles of argon gas is lowered from 2.80 x 10^2 K to 1.90 x 10^2 K.
(a) Find the change in the internal energy, ?U, of the gas.
=J
(b) Find the change in the average kinetic energy per atom.
In the deep space between galaxies, the density of atoms is as low as 1X10^6 atoms/m^3, and the temperature is a frigid 270 K. If this volume is a cube, what is the length of its sides in kilometers
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