How much heat will be released when 6.44 g of sulfur reacts with excess O2 according to the following thermochemical equation? 2S + 3 O2 → 2SO3 ΔH = -791.4 kJ What mass of propane, C3H8, must be burned in order to produce 76,000KJ of energy? C3H8 + 5 O2 → 3 CO2 + 4 H2O ΔH = -2200kJ Based on the information given in the thermal equation in 1 & 2 above, what would the ΔH for each of these equations be? 4SO3 → 4S + 6O2 ΔH = ____________ ⅕C3H8 + O2 → ⅗ CO2 + ⅘H2O ΔH =______________
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.
- How much heat will be released when 6.44 g of sulfur reacts with excess O2 according to the following thermochemical equation?
2S + 3 O2 → 2SO3 ΔH = -791.4 kJ
- What mass of propane, C3H8, must be burned in order to produce 76,000KJ of energy?
C3H8 + 5 O2 → 3 CO2 + 4 H2O ΔH = -2200kJ
- Based on the information given in the thermal equation in 1 & 2 above, what would the ΔH for each of these equations be?
4SO3 → 4S + 6O2 ΔH = ____________
⅕C3H8 + O2 → ⅗ CO2 + ⅘H2O ΔH =______________
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