Question

Does all molecules of ideal gas have same kinetic energy at constant temperature

Answer 1

The kinetic energy (KE) is dependent on its mass(m) and velocity (v) as shown in the relationship KE=(mv^2)/2. This relationship suggests that keeping KE constant, the m and v can manipulated as necessary. That actually happens in cases of different gasses with different molecules having different masses. Higher the mass of the molecule slower it moves. Note: Molar mass helps in calculating the mass of an individual molecule. If you consider a mole of molecules, their average velocity is used, because not all molecules move with same velocity.