Dimethyl ether (DME) synthesis provides a simple prototype of many petrochemical processes. Ten tonnes (10,000 kg) per hour of methanol are fed at 25°C. The entire process operates at roughly 10 bar. It is 50% converted to DME and water at 250°C. The reactor effluent is cooled to 75°C and sent to a distillation column … Read more
The Arrhenius model of global warming constitutes a very large composite system.3 It assumes that a layer of gases in the atmosphere (A) absorbs infrared radiation from the Earth’s surface and re-emits it, with equal amounts going off into space or back to the Earth’s surface; 240 W/m2 of the solar energy reaching the Earth’s … Read more
Analysis of CULTURAL CONTEXT Write an essay discussing its CULTURAL significance. Be sure to cover the following points in your analysis: – Identify the artist, title, period style and medium.– Discuss the subject matter of the artwork. Does it contain any iconography, symbolism, narrative story or message?– Discuss the cultural (religious, historical, political) context of … Read more
Research and write about a positive OR negative vision of transcendence and the future as it relates to your topic from the topics lists. Choose ONE topic from the lists below to explore. The goal is not to just present information about your topic, but to explore how it represents a positive or negative vision … Read more
Outbreak Investigation On February 7, 2018, a nurse employed at the Flinn Corporation noticed an increase in the number of employees who were sick. She was concerned that there may be a Salmonella outbreak at the company. She has interviewed each of the employees at the corporation. She has taken samples and sent them out … Read more
We wish to determine the final state for the gas in an inflated balloon. Initially, the balloon has a volume of V i at rest. The volume of the balloon is related to the internal pressure by V = a·P + b, where a and b are constants. The balloon is to be inflated by air from … Read more
An isothermal ideal gas expansion produces maximum work if carried out reversibly and less work if friction or other losses are present. One way of generating “other losses” is if the force of the gas on the piston is not balanced with the opposing force during the expansion, as shown in part (b) below. Consider … Read more
Call placement of a particle in box A, “heads” and placement in box B, “tails.” Given one particle, there are two ways of arranging it, H or T. For two particles, there are four ways of arranging them, {HH,HT,TH,TT}.We can treat the microstates by considering each particle in order. For example, {H T H H} … Read more
Estimate the change in entropy when one mole of nitrogen is compressed by a piston in a cylinder from 300 K and 23 liters/mol to 400 K and 460 liters/mol. Steam at 400C and 10 bar is left in an insulated 10 m3 cylinder. The cylinder has a small leak, however. Compute the conditions of the … Read more
Operating a wind tunnel for aircraft experiments begins with adiabatically and reversibly compressing atmospheric air (300 K) into long cylinders comprising a total volume of 20 m3 at 200 bars. The cylinders are initially at 1 bar. Estimate the minimal amount of work required (MJ) to perform the compression step. (a) Write the most appropriate energy … Read more