A student heats a 12.65 g sample of iron for 5 minutes until it reaches a constant temperature 100°C. They immediately add it to a beaker of water with an initial temperature of 21.3°C. After 2 minutes, the temperature of the water in the beaker remains constant at 23.5°C. How much energy did the sample of iron lose? (Note: the mass of water in the beaker is 50.0 gram)

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.