1. The problem statement, all variables and given/known data Derive m*= mM/(m+M) *hint* total angular momentum Iω=m*r2ω equals the sum of the individual angular momenta, where r = re + rn; re and rn are the distances of the electron and nucleus respectively from the center of mass. 2. Relevant equations Angular Momentum = mvr Conservation of Angular momenta m=mass of electron M=mass of nucleus 3. The attempt at a solution m*r2ω = m(re)2ω + M(rn)2ω I write out this equation but algebraically I can't seem to solve for m* properly so I must be missing something :/ sorry about the notation in the equation I am still learning how to properly use the tools in the message figure.