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Q3 (35/100) A mixture of three components (A, B, C) is separated by distillation. The feed is at its boiling point. The column is operated at 1 bar. The compositions of feed, distillate and bottoms are given below. Comp. Feed (kmol/h) Distilatte (kmol/h) Bottoms (kmol/h) A 20 19.6 0.4 B 30 16.2 13.8 C 50 1 49 The relative volatilities at the average of top and bottom column temperature are as follows: Comp. on A 2.5 B 1.8 C 1 Calculate the number of ideal stages needed for this separation for a reflux ratio of 2.5