The percent composition of what? It should ask to find the percent composition of one of the parts like copper, sulfer, or water.
The bond between the N and 0 (double bond) transfers and gives a -ve charge on O and a +ve charge on N atom at the group . Thus the +vely charged nitrogen is electron-deficient pulling electrons towards itself!
The combination of the +vely charged nitrogen and the electronegative oxygen atom leads to delocalization causing the resonance effect.
Answer: option C, ion-dipole
Explanation:
Since the order of intermolecular forces is as follows
Ion-dipole > Hydrogen bonding> Dipole-dipole> dipole -induced dipole> ion induced dipole> dispersion forces