Amolecule of unknown structure has a molecular formula of c9h8o2 . in the infrared spectrum there are absorptions at 1761, 1145, and 761 cm−1. in the c13 nmr spectrum, there are absorptions at δ 168.4, 152.0, 128.2, 128.0, 124.3, 122.8, 116.8, 29.1 and 23.6. in the h1 nmr spectrum, between δ 7.2 and 7.0, there is a complicated pattern that integrates to 4 protons. additionally, there are triplets at δ 3.0 and 2.7, each integrating to 2 protons. identify the structure of the unknown.

An uncovered pot of water lies out in the sun. which statements correctly describe what happens at the surface of the liquid water? 1. the vapor pressure remains constant regardless of the water temperature. 2. the vapor pressure is produced by water molecules that have evaporated. 3. the vapor pressure increases as the sun heats the water in the pot. 4. evaporation stops once the vapor pressure reaches a certain point. 5. evaporation and condensation both occur on the liquid’s surface.