Consider the mass transfer geometry in the figure below with two tubes of different diameters separating an evaporating liquid from a gas/vapor reservoir above it (at z=l). The system is at constant temperature and pressure. Assume steady-state; dilute system; cylindrical geometry with crosssectional areas: A0 for 0zm and A1 for mzl Write an expression for c1@z=m in terms of the known concentrations c10 and cll, and the values A0,A1,m, and l