Chapter 13, Problem 110E

Which of the following molecules have net dipole moments?For the molecules that are polar, indicate thepolarity of each bond and the direction of the net dipolemoment of the molecule.
a. ${\text{CH}}_{\text{2}}{\text{Cl}}_{\text{2}}{\text{, CHCl}}_{\text{3}}{\text{, CCl}}_{\text{4}}$
b. ${\text{CO}}_{\text{2}}{\text{, N}}_{\text{2}}\text{O}$
c. ${\text{PH}}_{\text{3}}{\text{, NH}}_{\text{3}}$