Sulfur tetrafluoride reacts slowly with oxygen gas to form sulfur tetrafluoride monoxide. Write a balanced chemical equation for the reaction. In the sulfur tetrafluoride monoxide molecule the O atom and the four F atoms are bonded to a central S atom. Write a Lewis structure for this molecule in which the formal charges of all atoms is zero. Use bond energies to estimate the enthalpy of the above reaction. (S-F bond energy = 327 kJ/mole). Is it endothermic or exothermic? Determine the electron geometry of the molecule and predict two possible molecular geometries. Which of the two molecular geometries in part d is more likely to be observed? Explain.
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.
Sulfur tetrafluoride reacts slowly with oxygen gas to form sulfur tetrafluoride monoxide.
- Write a balanced chemical equation for the reaction.
- In the sulfur tetrafluoride monoxide molecule the O atom and the four F atoms are bonded to a central S atom. Write a Lewis structure for this molecule in which the formal charges of all atoms is zero.
- Use bond energies to estimate the enthalpy of the above reaction. (S-F bond energy = 327 kJ/mole). Is it endothermic or exothermic?
- Determine the electron geometry of the molecule and predict two possible molecular geometries.
- Which of the two molecular geometries in part d is more likely to be observed? Explain.
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