When parallel light rays exit a concave lens, they This is not serious but HELP ME! I to get a grade

:p

Define dew point. i am writing this part to be able to ask the question

Some liquids can be distilled, but only at temperatures that are so high that it is impractical, or so high the compound decomposes. explain why distillation such compounds at significantly less than atmospheric pressure (some degree of vacuum) would solve this problem.

Find the mass, in grams, of 5.00*10^23 molecules of f2