Which of the following factors influences the intensity of a peak in the IR spectrum of a molecule?

A) mass of atoms
B) dipole moment
C) bond strength
D) bond length

The intensity of a peak in the IR spectrum of a molecule is influenced by the dipole moment of the molecule. This is because the IR spectrum is based on the absorption of IR radiation by the molecule's vibrating bonds, which is related to changes in the dipole moment during the vibration. Bonds with higher dipole moments will absorb more IR radiation and appear as more intense peaks in the spectrum.