Consider the ideal combustion of ethanol: C2H5OH(ℓ) + 3 O2(g) → 2 CO2(g) + 3 H2O(ℓ) ∆Ho = -1367.5 molar masses (g/mol): C2H5OH - 46.07 CO2 - 44.01 Indicate the 3 statements about the ideal combustion of ethanol that are true by checking the box in front of each true statement. The reaction is endothermic. The reaction is exothermic. There is more chemical energy stored in the products than in the reactants. When 50.0 g of ethanol combusts, 47.8 g of carbon dioxide are formed. When 50.0 g of ethanol combusts, 1480 kJ are released. When 1030 kJ are released, 40.7 g of water are formed.
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.
Consider the ideal combustion of ethanol:
C2H5OH(ℓ) + 3 O2(g) → 2 CO2(g) + 3 H2O(ℓ) ∆Ho = -1367.5
molar masses (g/mol): C2H5OH - 46.07 CO2 - 44.01
Indicate the 3 statements about the ideal combustion of ethanol that are true by checking the box in front of each true statement.
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The reaction is endothermic. |
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The reaction is exothermic. |
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There is more chemical energy stored in the products than in the reactants. |
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When 50.0 g of ethanol combusts, 47.8 g of carbon dioxide are formed. |
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When 50.0 g of ethanol combusts, 1480 kJ are released. |
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When 1030 kJ are released, 40.7 g of water are formed. |
Answer:
Thermochemical equation of combustion of ethanol is given to us and we have to identify its characteristics.
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