question:Calculate the total thermal energy in a liter of helium at room temperature and atmospheric pressure. Then repeat the calculation for a liter of air. I'm just confused because i thought thermal energy only depended on the translational kinetic energy of the particles. So why do i need all the pressure if the temperature is already given? the only equation that comes to mind is E(kinetic)=3/2kT and ...maybe the gas law?.. where do i go from here?