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.
Gaseous isobutane + Oxygen react to form carbon monoxide + liqid water.
delta Hr = __? Kj
![**Use tabulated heats of formation to determine the standard heats of the following reactions in kJ, letting the stoichiometric coefficient of the first reactant in each reaction equal one.**
**Physical Property Tables**
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**Oxidation of Nitrogen**
![Warning Icon] **Check stoichiometry.**
Nitrogen (N₂) and oxygen (O₂) react to form nitric oxide.
\[\Delta H^\circ_r =\]
\[90.37\]
kJ
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**Explanation:**
This section of an educational resource focuses on the oxidation of nitrogen to form nitric oxide. It involves calculating the standard heat of reaction (∆H°r) using tabulated heats of formation while ensuring correct stoichiometry. There's a warning to check stoichiometry, which indicates a possible error in the chemical equation or calculations. The calculated standard heat of reaction is 90.37 kJ.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fef720074-3ce9-464c-a25a-0db356318346%2F73d60124-0367-4fdb-a1fc-30d6409600d6%2F4kio8mm_processed.png&w=3840&q=75)
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