Kinetic Energy of a Rotating Water Molecule

[dgreenheck]

When calculating the kinetic energy of a rotating water molecule (translational and vibrational motion not important here), am I correct in assuming that you do all the calculations from the center of mass and analyze each axis of rotation (x,y,z)? The bent geometry is throwing me off! Any molecule would rotate about its center of mass wouldn't it?

 

[vela]

Yes, it would. I'd start by finding where the center of mass of the molecule is.