A2 + B2 → 2AB ΔH = -549 kJ The bond energy for A2 is half the amount of AB. The bond energy of B2 = 432 kJ/mol. What is the bond energy of A2?

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.