For each of the following reactions, identify whether the reactants or the products would have more potential energy. • 0 • C(s) + 2H₂O(g) + 90.1 kJ → 2CO₂(g) + 2H₂(9) CO(g) + H₂O(g)2CO₂(g) + 2H₂(g) + 41.2 kJ C₂H₂OH(I) + 30₂(9) 2CO₂(g) + 3H₂O(g) C3H8(9) + 6H₂O(g) → 3CO₂(g) + 10H₂(g) AH = -514.1 kJ ACH +374.1 kJ
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.
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C(s) + 2H₂O(g) + 90.1 kJ → 2CO2(g) + 2H₂(9)
CO(g) + H₂O(g) - 2CO₂(g) + 2H₂(g) + 41.2 kJ
C₂H₂OH(I) + 30₂(9) - 2C0₂(g) + 3H₂O(g)
C3H8(9) + 6H₂O(g) → 3CO₂(g) + 10H₂(g)
Use the following to answer the next 3 questions.
The smelting of iron occurs in a blast furnace, as represented by the following overall equation.
Step I 3Fe2O3(s) + CO(g) - CO₂(g) + 2Fe3O4(s) A+H° = -47.2 kJ
Step II Fe₂O4(s) + CO(g) - CO₂(g) + 3FeO(s)
A,H+19.4 kJ
Step III FeO(s) + CO(g) - CO₂(g) + Fe(s)
AH = -11.0 kJ
The molar enthalpy of reaction for Fe₂O3(s) in the reaction represented by Step I is
Record your 3-digit answer. Include sign; do not include units.
Potential Energy
(kJ)
AH-514.1 kJ
Reactants
ACH° +374.1 kJ
Which steps in the above process can be represented by the following potential energy diagram?
Select one:
O Step II only
O Steps I and III
O Steps I, II and III
O None of the above steps
Products
Reaction Pathway
•
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