2. Assuming air an ideal gas, calculate the entropy change when 1 mole of air is
ID: 702305 • Letter: 2
Question
2. Assuming air an ideal gas, calculate the entropy change when 1 mole of air is heated and expanded from 25°C and 1 bar to 100°C and 0.5 bar. Hint: Heat capacity for air is not constant. You may have to apply the temperature-dependent formula of heat capacity to carry out integration, etc., vhere values of constants are given in Table c.1 of the book. Use the following values for entahlpy/entropy: At 700°C and 300 kPa, use the following values: kJ kg K kJ kg H1 3,927.1 Please, please show any and all steps that helped you arive at your answers!Explanation / Answer
Change in entropy= integral of the limit of The on (dQ/dT)
=Limit of T(mCpT/dT)=
=mCplnT2/T1
=1*0.718*ln378/298
I am choosing nominal value of cp since the constant is not given in question
So 0.718*0.1265
=.098
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