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Use the worked example above to help you solve this problem. A cylinder contains2.15mol of helium gas at19.0°C. Assume that the helium behaves like an ideal gas.

(a) Find the total internal energy of the system.

(b) What is the average kinetic energy per molecule?

(c) How much energy would have to be added to the system to double the rms speed? The molar mass of helium is4.0010-3kg/mol.

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