State what is meant by the internal energy of a substance.
A sample of krypton gas behaves as an ideal gas at a temperature of 185∘C185^\circ\text{C}185∘C.
The mass of a single krypton atom is 1.4×10−25 kg1.4 \times 10^{-25}\text{ kg}1.4×10−25 kg. Calculate the root mean square speed of the atoms at this temperature.
root mean square speed = ...........................\text{...........................}........................... m s−1\text{m s}^{-1}m s−1
Calculate the internal energy of 3.6 moles3.6\text{ moles}3.6 moles of this ideal gas at 185∘C185^\circ\text{C}185∘C.
internal energy = ...........................\text{...........................}........................... J\text{J}J
