Is Kinetic Energy dependent on Atomic Mass?

Answer 1

For a singe molecule, Yes:

KE = (1/2)mv^2

Where m is mass, and v is velocity or speed of the center of the mass.

-or-

by relating to momentum:

KE=(p^2)/2m

Where p is momentum and m is again mass.

However, the AVERAGE kinetic energy of one mole of molecules does NOT depend on mass:

KE = (3/2)RT

where R is the molar gas constant, and T in temperature in Kelvin.

The average molecular kinetic energy for an ideal gas, depends solely on temperature.

Answer 2

No, kinetic energy is dependent on an object's velocity and mass, not just its Atomic Mass. The formula for kinetic energy is KE = 0.5 * mass * velocity^2, where both mass and velocity play a role in determining the kinetic energy of an object.