Question: is nf3 more polar than nh3?
Answer: The dipole moment of NH3 is 1.47 Debye and that of NF3 is 0.24 Debye. So NH3 is more polar than NF3. The electronegativities of N, F and H are 3.04, 3.98 and 2.2 respectively. Difference in electronegativity between N and H is 3.04 - 2.2 = 0.84.