uction of hydrogen(g) with oxygen(g) to fórm water(g) SP SDƏ 2H,(g) + O2(g)2H,O(g) 0.627 g H2(g) reacts with sufficient O,(g), 75.3 kJ is evolved. late the value of A,H for the chemical equation given. kJ/mol Submit Show Approach Show Tutor Steps
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.
![**Chemical Reaction of Hydrogen and Oxygen**
The reaction of hydrogen gas (\( \text{H}_2(g) \)) with oxygen gas (\( \text{O}_2(g) \)) to form water vapor (\( \text{H}_2\text{O}(g) \)) proceeds as follows:
\[
2\text{H}_2(g) + \text{O}_2(g) \rightarrow 2\text{H}_2\text{O}(g)
\]
When 0.627 g of \( \text{H}_2(g) \) reacts with sufficient \( \text{O}_2(g) \), 75.3 kJ of energy is evolved.
**Problem Statement**
Calculate the value of \( \Delta H \) for the chemical equation given.
**Input Required**
Enter the enthalpy change (\( \Delta H \)) in kJ/mol in the box provided.
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