Amolecule is known to have a molar absorptivity of 18,650 at a certain wavelength. a spectrometer is tuned to this wavelength and used to measure the absorbance of a solution of this substance in a b = 1 cm cuvette. the indicated absorbance of the sample was 1.04. the tested solution used in the experiment was prepared by dissolving 100 mg of the substance into a 100 ml volumetric flask. what is the molecular weight of the substance / molecule tested?

Why do the strengths of london (dispersion) forces generally increase with increasing molecular size? choose one: a. heavier atoms have stronger attractions for each other than lighter atoms. b. dispersion forces are all equal in magnitude; there is no size dependence. c. dispersion forces arise from the attraction between the nuclei of atoms, and larger molecules have larger nuclei. d. dispersion forces arise from dipoles caused by the electron distribution being distorted. larger molecules have more electrons and, therefore, more distortions and a bigger force. e. dispersion forces depend on distance. larger molecules are farther apart and so the forces are smaller.