14.Butane is the liquid found in lighter fluid. If it reacts with oxygen, it can undergo a combustion reaction represented by the following equation: 13. C₂H₁ (1) + 2 O₂ (g) 4 CO₂(g) + 5 H₂O (1) Use the enthalpy of formation data below to determine the enthalpy of this reaction. Compound AH, (kJ/mol) CO(g) -110.5 CO₂(g) -393.5 H₂O(1) -285.8 H₂O(g) -241.8 CH(D) -125.6 a. -2877 kJ b. -1745 kJ c. -2241 kJ d. -3127 kJ 15.Biofuels are one of the alternative energy sources that are being explored to replace fossil fuels. What is the one of the major advantages of using biofuels to fuel our vehicles as compared to other alternative energy sources? a. They are renewable, since they are produced from living plants. b. No modification needs to be made to typical internal combustion engine. c. Few greenhouse gases are produced. d. all of the above 16. This graph represents the changes in concentration associated with the following reaction equation: 2 H₂O (g) 2 H₂(g) + O₂(g) Reaction Progress 0.08 0.06 0.04 0.02- 0 50 100 150 200 250 300 350 400 Time (s) Which line represents the changes in concentration of hydrogen gas? a. A b B C. C d. none of the above Concentration (mol/L)

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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.