Which of the following processes are reversible in the thermodynamic sense? I. I

Question

Which of the following processes are reversible in the thermodynamic sense? I. Iron in the open air rusts. II. NaCl is discoverd in water and then recovered by the evaporation of the water. III. The ice in a mixture of ice and water at 0 degree C and 1 atm melts. I only II only III only III only II and III only I, II, and III are all reversible. The entropy change of the surroundings. deltaS_surr, is related to heat transfer q with respect to the system and temperature T by -q/T_sys = delta S_surr, +q/T_sys = delta S_surr. -q/T_sum = delta S_surr. q/T_surr = deltaS_sur. None of these, unless the system undergoes a reversible process

Explanation / Answer

Theoretically speaking, no process is reversible in our universe, since all processes are "real" and increas eentropy of universe

but in theory...

a) iron rusting can be reverted using correct redox methos

b) This can be performed over and over again

c) true, we can melt/freeze each time

so all of them are "reversible"

Q8.

dSsurr = Qsurrounding/Tsurr

Qsurr = -dH system

so

dSsurr = -dH system/Tsurr

dSsurr =  -Q system/Tsurr

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