The Keq is 0.0420 for the equilibrium reaction PCl4 (g) PCl3 (g) + Cl2 (g). Determine the equilibrium concentrations of all the species if the initial concentration of PCl5 is 0.0500M. Show work please

Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.