If the change in internal energy is measured to be 0, and heat is absorbed by the system, which of the following reactions could be taking place? (Assume a closed container at constant temperature with a constant external pressure). Correct: BaCO3(s) → BaO(s) + CO2(g) Incorrect C2H4(g) + 3O2(g) → 2CO2(g) + 2H2O(l) Incorrect N2(g) + 2O2(g) → 2NO2(g) Incorrect C(s) + O2(g) → CO2(g) Incorrect None of these reactions could apply.
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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Question 1. If the change in internal energy is measured to be 0, and heat is absorbed by the system, which of the following reactions could be taking place? (Assume a closed container at constant temperature with a constant external pressure).
Correct: BaCO3(s) → BaO(s) + CO2(g)
Incorrect C2H4(g) + 3O2(g) → 2CO2(g) + 2H2O(l)
Incorrect N2(g) + 2O2(g) → 2NO2(g)
Incorrect C(s) + O2(g) → CO2(g)
Incorrect None of these reactions could apply.
2) What is the molar mass of an unknown organic liquid based on the data from analysis of the liquid? Vaporization of 230.0 mg of the compound in a 120 mL bulb at 130°C gives a pressure of 440.0 torr.
Correct: 110. g/mol
Incorrect 230. g/mol
Incorrect none of these answers are correct
Incorrect 33.1 g/mol
Incorrect 1.10×105 g/mol
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