How many moles of carbon atoms are in 0.45 mole of c3h6o

The   number of  moles   of carbon  atoms  that are  in 0.45  moles of C3H6O  is  1.35 moles

     step by step  explanation

Find the total number  of   carbon  atom  in  C3H6O

that  is    1  x 3  =  3   atoms   
0.45  moles is for one  atom
what about  3 atoms

by cross  multiplication

3 x0.45 = 1.35   moles 

Determine the  wavelength of light emitted when an electron  in an li2+ ion  makes a transition from an orbital with n  =  6 to an orbital with n  = 5.