14. Lenthionine is composed of carbon, sulfur, and hydrogen. A 5.000 g sample of lenthionine contains 0.6375 g carbon, 0.1070 g hydrogen, and the remainder is sulfur. The molar mass of lenthionine is 188.4 g/mol. Determine the empirical and molecular formulas of lenthionine.

Curved arrows are used to mustrate the flow of electrons. Using the provided starting and product structures, draw the curved electron-pushing arrows for the following reaction or mechanistic step(s). Be sure to account for all bond-breaking and bond- making steps. H Select to Add Arrows H Select to Add Arrows I I I I I H₂C + Br: Select to Add Arrows Please select a drawing or reagent from the question area

£ Note: You may assume you have an excess of either reactant if the reaction requires more than one of those molecules to form the product. In the drawing area below, draw the skeletal ("line") structure of the missing organic product Y. Predict the organic product that forms in the reaction below: LOH .H two steps Click and drag to start drawing a structure. CE A

10. Molecules that interact with the infrared region of the electromagnetic spectrum, use the energy of the infrared radiation to: a. vibrate b. rotate (spin) c. break bonds apart