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4) A gas stream with 6.0mol%NH3 and a flow rate of 200kmol/h is to be scrubbed with 300 kmol/h water to lower the concentration to

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4) A gas stream with 6.0mol%NH3 and a flow rate of 200kmol/h is to be scrubbed with 300 kmol/h water to lower the concentration to 0.2mol%. The absorber is operating at atmospheric pressure at a temperature of 30degC. Determine the number of stages needed graphically

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