Consider interphase mass transfer of a species S between two immiscible liquids A and B. The interfacial mass transfer coefficient of S in liquid A is twice that of in liquid B. The equilibrium distribution of S between the liquids is given by y^S_A = 0.5y^S_B, where y^S_A and y^S_B are the mole-fractions of S in A and B, respectively. The bulk phase mole-fraction of S in A and B is 0.10 and 0.02, respectively. If the steady-state flux of S is estimated to be 10 kmol h^–1 m^–2, the mass transfer coefficient of S in A is ________ kmol h^–1 m^–2 (rounded off to one decimal place).