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.
8.If the specific heat capacity of ice is 2.10 J/(g·°C), how much heat is required to heat 530 g of ice from –45.0 °C to –15.0 °C?
Hint: Use the correct number of significant figures.
10. 1125 J of energy is used to heat 250 g of iron to 55 °C. The specific heat capacity of iron is 0.45 J/(g·°C).
What was the temperature of the iron before it was heated?
- specific heat of ice = 2.10 J/(g·°C)
- specific heat of water = 4.18 J/(g·°C)
- specific heat of water vapor = 2.07 J/(g·°C)
- latent heat of fusion of ice = 333.4 J/g
- latent heat of vaporization of water = 2256 J/g
If 9200 J of heat were added to 50 g of water as depicted by the heating curve, what is the final temperature of water?
14. If a sample of neon gas at 1.8 atm pressure and 150 K is put into a steel container with a constant volume and then heated to 450 K, what will the final pressure of the gas be?
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