n-Hexane is used to extract oil from soybeans. The solid residue from the extraction unit, which contains 0.78 kg liquid hexane/kg dry solids, is contacted in a dryer with nitrogen that enters at $85^{\circ} \mathrm{C}$. The solids leave the dryer containing 0.05 kg liquid hexane/kg dry solids, and the gas leaves the dryer at $80^{\circ} \mathrm{C}$ and 1.0 atm with a relative saturation of 70%. The gas is then fed to a condenser in which it is compressed to 5.0 atm and cooled to $28^{\circ} \mathrm{C}$, enabling some of the hexane to be recovered as condensate. a) Calculate the fractional recovery of hexane (kg condensed/kg fed in wet solids). b) A proposal has been made to split the gas stream leaving the condenser, combining 90% of it with fresh makeup nitrogen, heating the combined stream to $85^{\circ} \mathrm{C}$, and recycling the heated stream to the dryer inlet. What fraction of the fresh nitrogen required in the process of Part (a) would be saved by introducing the recycle? What costs would be incurred by introducing the recycle?

The base of a rectangular prism is 40 centimeters long and 5 centimeters wide.The height of the prism is 2 centimeters. Write two different equations that represent the volume of the prism.

Find all the inverses associated with the following functions and state their domains. $f(x)=2 /\left(x^{2}+2\right)$

You were recently hired as a process engineer by a pulp and paper manufacturing firm. Your new boss calls you in and tells you about a pulp dryer designed to reduce the moisture content of 1500 kg/min of wet pulp from 0.9 kg $\mathrm{H}_{2} \mathrm{O} / \mathrm{kg}$ dry pulp to 0.15 wt% $\mathrm{H}_{2} \mathrm{O}$. The design called for drawing atmospheric air at 90% relative humidity, $25^{\circ} \mathrm{C}$, 760 mm Hg into a blower that forces the air through a heater and into the dryer. When the operation was put into service, weather conditions were exactly as assumed in the design, and measurements showed that the air leaving the dryer was at $80^{\circ} \mathrm{C}$ and a gauge pressure of 10 mm Hg. However, there was no way to check the operation of the blower to see if it was delivering the specified volumetric flow rate of air. Your boss wants to check that value and asks you to devise a method for doing so. You go back to your office, sketch the process, and determine that you can estimate the air flow rate from the given information if you also know the moisture content of the air leaving the dryer. a) Propose a method to estimate the moisture content of the exit air. b) Suppose your measurement is carried out and you learn that the exit air at 10 mm Hg gauge has a dew point of $40^{\circ} \mathrm{C}$. Use that information and the mass of water removed from the wet pulp to determine the volumetric flow rate $\left(\mathrm{m}^{3} / \mathrm{min}\right)$ of air entering the system.

If a photograph of a moving merry-go-round is perfectly exposed, but blurred, at $\frac{1}{30} \mathrm{s}$ and f/11, what must the diaphragm setting be if the shutter speed is raised to $\frac{1}{120} \mathrm{s}$ in order to “stop” the motion?

Work your way through an argument using dimensional analysis to establish the $\lambda^{-4}$ dependence of the percentage of light scattered in Rayleigh Scattering. Let $E_{0 i}$ and $E_{0 s}$ be the incident and scattered amplitudes, the latter at a distance r from the scatterer. Assume $E_{0 s} \propto E_{0 i}$ and $E_{0 \mathrm{s}} \propto 1 / r$. Furthermore, plausibly assume that the scattered amplitude is proportional to the volume, V, of the scatterer; within limits this is reasonable. Determine the units of the constant of proportionality.

Completa estas frases de una manera lógica.
No tengo ningun profesor que...

Completa estas oraciones con la forma correcta del indicativo o del subjuntivo de los verbos entre paréntesis. ¿Sabe usted dónde BLANK (quedar) el Correo Central?

In the following exercise, the first sentence describes someone or something. Infer information from the first sentence, and then choose the word from the Word Bank that best completes the second sentence. altercation, inscrutable, hyperbole, formidable, incisive, expound, dolorous, humility. The colonists hoped that the sight of their massive fort, bedecked with dozens of cannons, sniper holes, and watch towers, would dissuade the natives from attack. From this sentence, we can infer that the colonists created a[n] _____ image in an effort to avoid conflict.

Each point lies on a parabola that has its vertex at (0,1). Write the equation of the parabola. Indicate whether the graph opens up or down. (-1,6)

Make up a table with columns headed by values of $\theta$ running from $-\pi / 2$ to $2 \pi$ in intervals of $\pi / 4$. In each column place the corresponding value of $\sin \theta$, and beneath those the values of 2 $\sin \theta$. Next add these, column by column, to yield the corresponding values of the function $\sin \theta+2 \sin \theta$. Plot each of these three functions, noting their relative amplitudes and phases.

Are $5n + 9 + n$ and $3(2n + 9)$ equivalent expressions? Use substitution to check your answer.

Write in point-slope form the equation of the line through each pair of points. (0, 1) and (2, -5)

Which statement best reflects the central idea of the passage? A. The United States is in great danger and has to put its own interests above everything else. B. The United States faces great challenges and taking them on is honorable and exciting. C. Americans are in a better position than any other people in history. D. Americans have been selfish and must start contributing to their country.