Dipole moment

[Katie Frei 1L]

Why does CN2H2 have a dipole moment? When drawing the Lewis structure, it looks to be symmetrical when the arrows point toward the two nitrogens, so I'm confused why the molecule has a dipole moment. Thanks!

[Neil Hsu 2A]

If you look at the lewis structure of CN2H2, the carbon is triple bonded to one of the nitrogens on one side and single bonded to the other nitrogen on the other side. The single bonded nitrogen is bonded to the two hydrogens. There is a net dipole since the single bonded nitrogen attracts the electrons of the hydrogens (and carbon) to create a partial positive charge on the hydrogens. Additionally, the triple bonded nitrogen will attract the electrons from carbon to have a partial negative charge. Thus, having partial charges on opposite side, there is a dipole.