Problem 1. A feed gas containing 0.0015 mole fraction of H2S is absorbed by a water stream at 20 C. The water is pure, and 97% of the H2S will be absorbed from the gas into the water. The total gas flow rate is 10 kmol/hr and the total liquid flow rate is 2000 kmol/hr. Because the system is dilute, both the gas and liquid flow rates can be assumed to be constant. The total pressure is 3.5 atm. Equilibrium data is given in Table 12-1. a. Determine the mole fractions of H2S in the liquid and vapor outlet streams. b. Determine the number of equilibrium stages using a McCabe-Thiele type diagram. It is not necessary to determine the fractional number of stages. c. Would raising the absorber operating pressure increase or decrease the number of stages required? Explain your answer. d. Determine the number of equilibrium stages using the Kremser equation