Question: In the BETT theory of colloids, a certain colloid system exhibits monolayer adsorption of gas molecules on the surface of the colloidal particles. The BETT equation used to describe this adsorption phenomenon is given by: - (P./P) (1-C)/(C) = -K(P/P) where C is the fraction of the surface covered by gas molecules, P is the equilibrium pressure of the gas, PO is the saturation pressure of the gas, and K is a constant related to the energy of adsorption. Given that the saturation pressure PO is 2.5 atm and the equilibrium pressure P is 1.8 atm, calculate the fraction of the surface covered by gas molecules (C) using the BETT equation. Explain the working steps involved in the calculation.