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For this problem we would use the equation U=3/2nRT. Internal energy (U) is the total of all the energy associated with the motion of the atoms or molecules in the system. This includes energy associated with translation, rotation, and vibration. For monoatomic gases, like Kr, the only contribution to the energy comes from translational kinetic energy. The equation for internal energy is derived from the equation for kinetic energy KE=1/2mv2. Since you have three degrees of freedom (x,y,z), the total energy is 3/2nRT.
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