20. Calculate the freezing temperature of water under a pressure of 2 atmospheres, Given : 1,= 80 calgm density of = 13.6 gm/c.c. (C.U. 1964) ice = 0.92 gm/c.c., density of Hg [Ans: -0.0072°C] E40 gellam)
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.
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![20 Calculate the freezing temperature of water under a pressure of 2 atmospheres, Given : 1,= 80 ca/gm density of
ice = 0.92 gm/c.c., density of Hg = 13.6 gm/c.c. (C.U. 1964)
21. What is approximate b. pt. of water at a place where the atmospheric pressure is 600 mm? (!̟ = 540 cal/gm).
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[Ans: -0.0072°C)
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(Ans: 93.4°C]
22. Calculate the change in the m. pt. of ice brought about by application of 100 atm. pressure. The volume-change
on melting is -1.63 x 10-3 litre/mole and the enthalpy of fusion is 1440 cal/mole.
(Ans: -0.75°C]
23. What is the latent heat of fusion of tin (m. pt. 504°K), if its m. pt. is raised by 0.328 C when pressure is increased
[Ans: 14.48 cal/gm.]
24. At one atm. mercury melts at -38.87°C and its density is 13.69 gm/c.c. The density of thesolid is 14.19 gm/c.c.
(Ans: -32.6 C)
25. The density of solid and liquid phenol (m.pt. 41°C) are 1.072 and 1.056 gm/c.c. Estimate the change in m.pt. if
by 10 atm? The volume-change is 0.03894 cc./gm.
The heat of fusionis 2.33 cal/gm. What would be the m.pt. of mercury at 1000 atm.?
[Ans: 0.039'C]
the pressure is raised to 10 atm. (I, = 25 cal/gm)
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26. The transition pt. of a to B sulphur is 96.6°C. The specific volumes are 0.495 and 0.505 c.c. respectively. The
heat of transition is 75 cal/gm-atom. What will be the transition temperature at 25 atm. pressure?
|Ans: 97.52 C]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fcc1ac394-8511-4830-998e-782c6094bb99%2F21a1035f-127e-494a-8a5e-225119186863%2Fsixddri_processed.jpeg&w=3840&q=75)
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