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The bottom of a pan is made of a 4-mm-thick aluminium layer. In order to increase the rate of heat transfer through the bottom of the pan, someone proposes a design for the bottom that consists of a 3-mm-thick copper layer sandwiched between two 2- mm-thick aluminum layers. Will the new design conduct heat better? Explain. Assume perfect contact between the layers
The stoichiometric point in the titration is reached 60.65 minutes after Y and Z were started simultaneously. The total volume in the beaker at the stoichiometric point is 655 mL. Calculate the flow rates of burets Y and Z. Assume the flow rates r..
Describe the principles of a vapour adsorption refrigeration system, and compare this to a vapour recompression system. Which of the two systems is more suitable for refrigeration processes in a brewery or distillery and why?
Assume the amount of radioactivity is the same in each case. Explain your answer on the basis of the chemical properties of Sr and Xe. Why are the chemical properties of a radioactive substance important in assessing its potential health hazards?
Risk Analysis and Management: Fragility versus Loads and Fire Explosion Safety Issues, 1. A propane tank is located 100 m away from the nearest buildings. The fragility to explosion can be expressed by
Find the implied adsorption isotherm, and show under what conditions it reduces to the Langmuir isotherm.
Propane at 343.15 K (70°C) and 101.33 kPa is compressed isothermally to 1500 kPa. Estimate AH and AS for the process by suitable generalized correlations.
Make a rough estimate of the cost of steam per ton, produced from a packaged boiler. 10,000 kg per hour of steam are required at 15 bar. Natural gas will be used as the fuel, calorific value 39 MJ/m3 (roughly 1 MMBtu/1000 scf). Take the boiler eff..
Estimate a value for the total project cost that will give 98% confidence that the project can be carried out within the amount estimated.
A beaker filled with an equimolar liquid mixture of ethyl alcohol and ethyl acetate evaporates at O°C into still air at 101 kPa (1 atm) total pressure. Assuming Raoult's law applies, what will be the composition of the liquid remaining when half t..
When algae growing in water containing only 16O were furnished carbon dioxide containing 18O, no 18O was found to be evolved from the oxygen gas produced. What conclusions about photosynthesis can be drawn from these experiments?
Determine the frequency of the rotor voltages of the induction machine.
Develop a general equation that relates the average value of n to the mass of a given mixture of PCBs and the mass of AgCl produced. b. A 0.1947-g sample of a commercial PCB yielded 0.4791 g of AgCl. What is the average value of n for this sample?
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