## C

We know that S predicted by this expression is somewhat too large because of the linearized VLE. However, we may correct it such that it satisfies the exact relationship S = aN at infinite reflux (where Lb/Vb = Vt/Lt = 1 and c= 1) by dropping the factor 1/(xHFyLF) (which as expected is always larger than 1). At finite reflux, there are even more stages in the feed region and the formula will further overestimate the value of S. However, since c > 1 at finite reflux, we may partly counteract this by setting c = 1. Thus, we delete the term c and arrive at the final extended Fenske formula, where the main assumptions are that we have constant relative volatility, constant molar flows and that there is no pinch zone around the feed (i.e. the feed is optimally located):

## Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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