Fluid Mechanics

The designers of a portable barbecue need to estimate the viscosity of a Propane/lsobutane gas mixture at atmospheric pressure. The mixture is 72% (by mole fraction) Propane and the remainder is Butane. The mixture is at a temperature of 30C. Under the prevailing conditions, the viscosity of butane is estimated at 7.53 106Pas Determine the viscosity of the Propane/Butane gas mixture. (Note - You must use the Chapman-Enskog equation to determine the viscosity of Propane, and then calculate the viscosity of the mixture using the mixture equation with interaction parameters)