Bath salts such as Epsom contain hydrate salts such as MgSO4 7H20 (magnesium sulfate heptahydrate). When heated, water is released as vapor and anhydrous MgSO4 remains. Determine how many moles of vapor are released when 15.5 g of MgSO4-7H20 are heated. Hint: Include H20 when calculating the molar mass. 37. А. 0.291 mol В. 0.440 mol С. 0.253 mol D. 0.0629 mol E. 0.129 mol
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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