It is required to absorb 95% acetone from its mixture with N2 in a counter-current tray tower. The inlet gas contains 7 mol% acetone. The total gas rate at the tower inlet is 30 kmol/hr. The absorbent is water that contains 0.1 mol % acetone and it enters the tower at a rate of 90 kmol/hr. The tower operates at 25o C and 1 atm. The equilibrium relationship is given by y* = 2.53x. Determine the number of ideal trays necessary for this separation using Kremser analytical method.

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