To calculate the maximum achievable monolayer coverage of a gas on a solid surface, we can use the Langmuir isotherm equation: = KP / 1 + KP where is the fractional coverage of the surface, K is the Langmuir constant 0.05 L/mol , and P is the pressure 1 atm . = 0.05 L/mol * 1 atm / 1 + 0.05 L/mol * 1 atm = 0.05 / 1 + 0.05 = 0.05 / 1.05 0.0476The maximum achievable monolayer coverage of the gas on the solid surface at 25C and 1 atmosphere is approximately 0.0476 or 4.76%.