The percentage of transmittance of a solution of X at 300 nm and 25 C is 20% for a 5x10^-4 M solution in a 1-cm cell. a) Calculate the absorbance A and the molar absorption coefficient,ε . b) Calculate the energy in joules per mole, and electron volt (eV) of photons of wavelength 300 nm.
(h=6.62x10^-34 J s), (c=3x10^8 m s^-1), (1 eV=1.6x10^-19 J), (1 nm =10^-9 m)

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.