Heat and Enthalpy Problems 1. Suppose you mix 21.0 g of water at 52.7° C with 54.9 g of water at 31.5° C in an insulated cup. What is the maximum temperature of the water after mixing? Answer: Asystem = -4surroundings Яhot H,0 — -Ясol H20 Тhot Hz0Chot н,о47hot Hz0 = -mcool H2oCcool H204Tcool H20 (21.0 g) ( 4.184- g· °C (4.184)ATcool H,0 AThot H20 = -(54.9 g)( AT cool H20 g• °C, 87.86) ATrot H,0 = (229.702–) ATcool H20 ATrot H20 (2.614)ATcool H20 %3| Tр — 52.7°C %3D2.614T — 31.5°C 2.614T; = = 21.2°C Tf = 8.11°C
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.
- Identify at least three errors in the given answers
- Explain, as if you were explaining to a friend or study group member, how to correct the errors.
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