If f = moles of vapour present per mole of feed...

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If f = moles of vapour present per mole of feed, then the slope of feed line is (Mcabe-Thiele method)

A. $$\frac{{1 - {\text{f}}}}{{\text{f}}}$$

B. $$ - \frac{{{\text{f}} - 1}}{{\text{f}}}$$

C. $$ - \frac{1}{{\text{f}}}$$

D. $$ - \frac{{\text{f}}}{{1 - {\text{f}}}}$$

Answer: Option C

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