+2 3H₂2₂)= Exercise 4. In the hydrogen economy, the production of H₂ is based on solar energy and the hydrogen - gas can then be used as fuel: gi 67het 572 2H₂(g) + O₂(g) -> 2 H₂O (1) 34.30:57 15/mal An important advantage of hydrogen as a fuel is that it does not cause pollution. A major disadvantage, however, is that it is a gas and is therefore much more difficult to store than a liquid or solid. Calculate the required volume of hydrogen gas at 25°C and 1 atm to provide as much energy as the combustion of 1 liter octane (C8H18). The density of octane is 0.7 kg/l and AH = -249.9 kJ/mol. [2659 liter]
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.
![2 = √₂
2NH₂ +
Exercise 4. In the hydrogen economy, the production of H₂ is based on solar energy and the hydrogen
gas can then be used as fuel:
19,67 hat
$22
2H₂0 (1)
-34:36:57 15/mol.
An important advantage of hydrogen as a fuel is that it does not cause pollution. A major disadvantage,
however, is that it is a gas and is therefore much more difficult to store than a liquid or solid. Calculate
the required volume of hydrogen gas at 25°C and 1 atm to provide as much energy as the combustion of
1 liter octane (C8H₁8). The density of octane is 0.7 kg/l and AH = -249.9 kJ/mol. [2659 liter]
5470.57 15s /mol
2H₂(g) + O2(g)
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