23 Consider the hypothetical thermochemical equation 3 A+B 2C for which AH = 71.5 kJmol. %3D If you have 5.30 moles of A, how much heat would be absorbed? O of 1 point earned 10 attempts remaining If the reaction absorbs 345 kJ of heat, how many moles of C would be produced? O of 1 point earned 10 attempts remaining What would AH be for the reaction 2 C-3A+B? C. O of 1 point earned 10 attempti remaining
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.
![**Thermochemistry Exercise**
Consider the hypothetical thermochemical equation:
\[ 3 \, \text{A} + \text{B} \rightarrow 2 \, \text{C} \]
For this reaction, the enthalpy change \(\Delta H\) is 71.5 kJ/mol.
**Questions:**
**a.** If you have 5.30 moles of A, how much heat would be absorbed?
- \[ \text{0 of 1 point earned} \]
- 10 attempts remaining
**b.** If the reaction absorbs 345 kJ of heat, how many moles of C would be produced?
- \[ \text{0 of 1 point earned} \]
- 10 attempts remaining
**c.** What would \(\Delta H\) be for the reaction \(2 \, \text{C} \rightarrow 3 \, \text{A} + \text{B}\)?
- \[ \text{0 of 1 point earned} \]
- 10 attempts remaining
**d.** What would \(\Delta H\) be for the reaction \(9 \, \text{A} + 3 \, \text{B} \rightarrow 6 \, \text{C}\)?
- \[ \text{0 of 1 point earned} \]
- 10 attempts remaining
**e.** Which one of the following reactions would have an enthalpy change of \(-2 \times \Delta H\)? Here, \(\Delta H\) refers to the enthalpy change of the original reaction.
- \[ \text{0 of 1 point earned} \]
- 10 attempts remaining
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This exercise involves calculating enthalpy changes based on stoichiometry and understanding the relationship between reaction stoichiometry and enthalpy changes.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd862c25f-a636-4347-831e-84b629db5903%2Fdc9d0f8d-370e-43af-bf1d-c0f94e1c81cb%2Fxaolh_processed.jpeg&w=3840&q=75)
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