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)