7. A student collects the following data when decomposing an unknown mixture containing baking soda, NaHCO3. Find the mass of baking soda in the sample and the % of baking soda in the sample. 2 NaHCO3 (s) → Na2CO3 (s) + H₂CO3 (g) Mass of test tube + unknown mixture (before heating) Mass of test tube Mass of test tube + residue (after heating) a. Mass of unknown mixture: b. Mass of H₂CO3 (before heating - after heating): c. Mass of NaHCO3 in unknown mixture and percent of NaHCO3 in unknown Mass of NaHCO3:_ 19.310g 18.188g 19.041g Percent of NaHCO3 in unknown mixture: 52
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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