Which formula represents a nonpolar molecule?
(1) ch4 (3) h2o
(2) hcl (4) nh3

(1) CH4 is a nonpolar molecule, because the differences in electronegativity is so small, and also its molecular structure is causes for its dipole moments to cancel out. The rest have large differences in electronegativity and have structures that do not cancel out the dipole moments.

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