Washing soda, a compound used to prepare hard water forwashing laundry, is a hydrate, which means that a certainnumber of water molecules are included in the solid structure.Its formula can be written as Na2CO3 . xH2O, where x isthe number of moles of H2O per mole of Na2CO3. When a2.558-g sample of washing soda is heated at 125 °C, all thewater of hydration is lost, leaving 0.948 g of Na2CO3. What isthe value of x?
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.
Washing soda, a compound used to prepare hard water for
washing laundry, is a hydrate, which means that a certain
number of water molecules are included in the solid structure.
Its formula can be written as Na2CO3 . xH2O, where x is
the number of moles of H2O per mole of Na2CO3. When a
2.558-g sample of washing soda is heated at 125 °C, all the
water of hydration is lost, leaving 0.948 g of Na2CO3. What is
the value of x?
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