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Problem 4.8: Steam is compressed by reversible isothermal process from 15 bar, 250 °C, to a final state that consists of a vapor-liquid mixture with a quality of 32%. a) Calculate the amount of work. b) Calculate the amount of heat that is required to maintain isothermal conditions. Is this heat added or removed from the system? Problem 4.9:
Steam in a closed system is compressed by reversible isothermal process in a heat bath at 250 °C, starting from an initial pressure of 15 bar. During the process, the steam transfers 2000 kJ/kg of heat to the bath. Determine the final state and the amount of work involved.
200 kJ of heat is added under constant pressure to 1 kg of steam initially at 30 bar, 400 °C. What is the final temperature? What is the change in internal energy during this process?
Assume that the absorbance of each form of the dye is linearly related to its pH. Devise a method to measure the pH of the dye.
b. A 12.6-g sample of acetylene, C2H2, produced a temperature increase of 16.9C in the same calorimeter. What is the energy of combustion of acetylene (in kJ/mol)?
Given the following experimentally determined standard molar entropies at 298.15 K and 1 bar, S [CH3OH]=126.8 J⋅K-1⋅mol-1 S°[CO]=197.7 J⋅K-1⋅mol-1
Develop forecasts for the PET-PX margin based on contract pricing using data from (a) Jan. 2000-Oct. 2010, (b) Jan. 2006-Oct. 2010, and (c) Oct. 2009-Oct. 2010. In each case, predict the PET-PX margin in Jan. 2020. Which forecast appears to be mos..
questiona personal protective equipment are only used when it has proven impractical to control occupational hazards by
The armature-circuit resistance is 0.25 Ω and the series-field resistance is 0.25 ?4. Calculate the speed of the motor
The nutritional information on a cereal box shows that one serving of dry cereal has 90 calories (actually kilocalories). If one were to burn a serving of cereal, the amount of heat given off would be sufficient to raise the temperature of 1 kg of..
Estimate relative errors in the calculation of free carriers concentration when the Maxwell-Boltzman n statistics is applied for semiconductors with Ferm i energy wi thin the energy gap, if the Fenni level is 3kbT, 2k1,T, k,,T away from the ban..
The Soave-Redlich-Kwong equation is a commonly used cubic equation of state, second in popularity only to the Peng-Robinson Equation of state. In this problem, just derive the two equations (7.66) given in the problem.
in gas-shy-solid fluidization it is frequently common to have a wide size distribution of particles present in the
production of chemicals from coalcoal has been considered a major component of u.s. energy reserves for a long time and
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