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**Summary:**Hello, I need some help with this problem since my professor is bad at explaining (he reads a book and repeats everything), there's a problem online similar, but values and what is asked is different.

A gas stream (1) contains 18 mol% (40.2 mass%) hexane and remainder nitrogen flows to a condenser, where its temperature is reduced so that some of the hexane is liquified. The liquid hexane (stream 2) leaves the condenser at a rate of 990g/min (59.4 kg/h). The uncondensed gas stream (3) leaving the condenser now contains 12 mass% hexane. The process operates at a steady rate.

1. What is the flow rate of the stream (3) in kg/h?

2. What is the flow rate of the stream (1) in kmol/h?

I'd really appreciate if you could help me understand this problem, thank you in advance!

**[Moderator's note: Moved from a technical forum and thus no template.]**

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