The sublimation point of CO2 (solid) at 1 atm is -78.37oC and the enthalpy of sublimation (solid to vapor) is 3116 joule/mole. cp (CO2(solid))=50 joule/mole.K. and for cp CO2(g) look at Appendix. 5 gram CO2 gasis held at T=300/X oK in container for some times as represented below: CO2 (gas) at T oK ==➔Dry Ice (Solid CO2) at T oK Calculate: a) The enthalpy of deposition at T oK b) The entropy of deposition at T oK. c) The entropy change of surroundings at T oK. Assume surroundings behave reversibly. Surrounding temperature is T
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
The sublimation point of CO2 (solid) at 1 atm is -78.37oC and the enthalpy of sublimation
(solid to vapor) is 3116 joule/mole. cp (CO2(solid))=50 joule/mole.K. and for cp CO2(g) look
at Appendix.
5 gram CO2 gasis held at T=300/X oK in container for some times as represented below:
CO2 (gas) at T
oK ==➔Dry Ice (Solid CO2) at T
oK
Calculate:
a) The enthalpy of deposition at T
oK
b) The entropy of deposition at T
oK.
c) The entropy change of surroundings at T
oK. Assume surroundings behave
reversibly. Surrounding temperature is T
oK
d) Entropy change and entropy produced of universe.
e) Is this deposition process spontaneous? prove! At given temperature T.
x=4.5
Trending now
This is a popular solution!
Step by step
Solved in 4 steps with 7 images
