# Chemical Process- Energy and Processing (thermodynamics), engineering homework help

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### Question Description

Assignment 1 of thermodynamics + chemical process class

Working please (for table values please just note which table used and I will match it up with my own textbook, or references would be great)

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Tobyy
School: UIUC

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1.
A closed metal cylinder contains steam at 1 bar and 500 C. how much heat must be removed at constant
volume in order to produce saturated vapor.
Solution:
Saturated vapor is steam that has not been heated past the boiling point for that pressure.
saturated vapor has a "quality" of 100% and happens at 100oC and 1 atm.,
therefore the temperature change will be 500oC β 100oC = 400
Heat transfer = (mass)(specific heat)(temperature change)
Q = mcΞT
Q = heat that need to be removed
m = mass; since the volume remains constant, the mass of the vapor will remain constant (1)
c = specific heat, J/g Β°C, from the steam table = 2.0373
ΞT = change in temperature
= 1x 2.0373 x 400 = 814.92 J

2.
Liquid water at 180 C and 1002 kPa has internal energy of 762.0 kJ kg and a specific volume of 1.128
cm3/g

What is its enthalpy?
π»=π+ππ=762.0 kJkg+(1002.7 kPa)(1.128 cm3g)(1 m100 cm)3(1000 g1 kg)=πππ.π π€ππ€π

b) The water is brought to the vapor state at 300 Β°C and 1500 kPa, where its internal energy is
2784.4 kJ/kg and its specific volume is 169.7 cm3/g. Calculate ΞU and ΞH for the process.

Ξπ=2784.4 kJkgβ762.0kJkg=ππππ.π π€ππ€π
π»2=π2+π2π2=2784.4 kJkg+(1500 kPa)(169.7 cm3g)(1 m100 cm)3(1000 g1 kg)=ππππ.ππ π€ππ€π

Ξπ»=3038.95 kJkg β 763.1 kJkg= ππππ.π π€π/π€π
3.
0.2 of air initially at 0.6 bar and 20 C undergoes the cycle consisting of three mechanically reversible
process. The air is compressed isothermally to a pressure of one bar during the process 1-2.

4.
A heat engine produces energy by taking in 100 Kj/mol of heat from a reservoir at 600K and exhausts
heat to the environment at 300K. What is the maximum work that can be achieved by this engine and the
minimum heat...

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Review

Anonymous
Tutor went the extra mile to help me with this essay. Citations were a bit shaky but I appreciated how well he handled APA styles and how ok he was to change them even though I didnt specify. Got a B+ which is believable and acceptable.

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