Consider the reaction below then answer the following questions. The molar mass of C3H8 = 16.01 g/mol, molar mass of O2 is 32.00 g/mol and the specific heat of water is 4.184 J/g•ºC C3H8 (g) + 5 O2 (g) à 3 CO2 (g) + 4 H2O (l) ∆H = -2220 kJ Is this reaction an exothermic or endothermic reaction? ______ How much heat (in kJ) would be released if 7.25 O2 is allowed to react with excess C3H8? How much C3H8, in grams, would be needed to release 325 kJ of heat? Assume C3H8 is allowed to react with excess O2 in this problem.
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 reaction below then answer the following questions. The molar mass of C3H8 = 16.01 g/mol, molar mass of O2 is 32.00 g/mol and the specific heat of water is 4.184 J/g•ºC
C3H8 (g) + 5 O2 (g) à 3 CO2 (g) + 4 H2O (l) ∆H = -2220 kJ
- Is this reaction an exothermic or endothermic reaction? ______
- How much heat (in kJ) would be released if 7.25 O2 is allowed to react with excess C3H8?
- How much C3H8, in grams, would be needed to release 325 kJ of heat? Assume C3H8 is allowed to react with excess O2 in this problem.
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