Do letters b and c. Thanks, and show all work Consider the reaction: CaCO_3(s) r

Question

Do letters b and c. Thanks, and show all work

Consider the reaction: CaCO_3(s) rightarrow CaO_(s) + CO_2(s) Standard thermodynamic values at 25 degree C are listed below: a) Calculate Delta H degree, Delta S degree for the reaction at 298 K. Is the reaction spontaneous? b) Sketch a graph of Delta G degree versus T. Indicate on the graph where Delta G degree is at 298 K. Will Delta G degree = 0 at some temperature? If so, indicate the temperature. c) Sketch a graph of Delta G versus P of CO_2 at 298 K. Indicate on the graph where Delta G = Delta G degree. Will Delta G = 0 at some pressure of CO_2? If so, indicate the pressure.

Explanation / Answer

For the reaction, deltaGf = deltaGfCaO+ deltaGof CO2 –detlaGof CaCO3= -604-394+1129= 131 Kj

deltaH= -635-393.5+1207=178.5 Kj

deltas= 40+214-93= 161 J/K

since deltaG is +ve, the reaction is not spontaneous at 298 K

deltaG= 178.5-T*deltas, =178.5-T*161/1000

2.

from the plot at T=1108.696, deltaG=0

3. The plot above shows PCO2 (atm) vs deltaG. At PCO2= 0.9487 atm, deltaG= 130.5 Kj

2.

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