2/10/20 Name/Date: Uvonne Vanen arra Chemistry 1412: CH 6 & 17 take home quiz Show all your work. You may need extra paper. 1. Use the standard enthalpies of formation from your handout to calculate the AH for the reaction. CH4(g) + 4C12(g) CCI(8) +4HCI(8) beng inate 2CO2(g) + 3H2O(1) AHXN = -1.37 X 10 kJ/mole When a 15.1 g sample of ethyl alcohol, C2H5OH. is burned, how much energy is released? 2. Consider the reaction C2H5OH(1) + 302(g) Given the following data: 3. AH = -2600 kJ ACOle) + 2H20(1)
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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1. Use the standard enthalpies of formation from your handout to calculate the )delta) H for the reaction.
CH4(g) + 4Cl2(g) ---> CCl4(g) + 4HCl(g)
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