Substances A and B are both volatile liquids with p_A^∗ =300 Torr, p_B^∗ =250 Torr, and K_B =200 Torr (concentration expressed in mole fraction). When x_A =0.9, b_B =2.22mol kg⁻¹, p_A =250 Torr, and p_B =25 Torr. Calculate the activities and activity coefficients of A and B. Use the mole fraction, Raoult’s law basis system for A and the Henry’s law basis system (both mole fractions and molalities) for B.