1. (a) Based on the information below, determine ΔGrxn (in kJ) for the following reaction: 2A(g) + B(g) → 2C(g). A → B ΔGrxn = 75kJ ½ C → B ΔGrxn = 45kJ C → A ΔGrxn = -25kJ Answer ________________ 2. The reaction in the previous question is exothermic. Which of the following statements is true? A The reaction is spontaneous at all temperatures. B The reaction is spontaneous at high temperatures. C The reaction is spontaneous at low temperatures. D The reaction is not spontaneous at any temperature.
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.
1. (a) Based on the information below, determine ΔGrxn (in kJ) for the following reaction: 2A(g) + B(g) → 2C(g).
A → B ΔGrxn = 75kJ
½ C → B ΔGrxn = 45kJ
C → A ΔGrxn = -25kJ
Answer ________________
2. The reaction in the previous question is exothermic. Which of the following statements is true?
| A |
The reaction is spontaneous at all temperatures. |
|
| B |
The reaction is spontaneous at high temperatures. |
|
| C |
The reaction is spontaneous at low temperatures. |
|
| D |
The reaction is not spontaneous at any temperature. |
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