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Calculate ln S? If XLK=0.41 and XHK = 0.005 and XL= 0.417 and XH= 0.01, then

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Calculate ln S? If XLK=0.41 and XHK = 0.005 and XL= 0.417 and XH= 0.01, then

(a) 9.45

(b) 8.90

(c) 8.137

(d) 7.98

The question was asked during an online exam.

My question is taken from Reflux Stage Relationships in chapter Column Process Design, Optimization and Shortcut Calculations of Distillation Design

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Correct choice is (c) 8.137

Easiest explanation: As ln (0.41/0.005) (0.417/0.01) = 8.137.

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