Part IlI: Enthalpy of Precipitation Sodium Acetate Trihydrate, NaC2H3O2 3H20 Mass of NaC2H3O2 3H2O in test tube: 17.5 grams NaC2H3O2 3H2O molecular weight: 136.08 g/mol Mass of H20 in test tube: 5.00 grams Tinitial:23.4°C Timal: 34.1°C AT 10.7°( (Data Calculations on Reverse Side)
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.
![Part IlI: Enthalpy of Precipitation Sodium Acetate Trihydrate, NaC2H;Oz° 3H2O
Mass of NaC2H3O2 3H2O in test tube:
17.5 grams
NaC2H3O2 3H20 molecular weight:
136.08 g/mol
Mass of H2O in test tube:
5.00 grams
Tinitial: 23.4°L
Tinal: 34.1°C
AT 10.7
(Data Calculations on Reverse Side)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F579203f0-bd1c-4774-ac86-eb65259ca8df%2F78ce16b4-93d2-4b5f-a967-45584e30be9d%2Fcybxrkk_processed.jpeg&w=3840&q=75)
![4. In part III, you precipitated NaC2H3O2•3H2O from a saturated solution. Co for the solution/solid mixture
1.86 J/g-°C. In reality only about 6.0 grams (out of 17.5 g) of sodium acetate in the test tube actually
precipitated from solution. Use this information to calculate AH for the precipitation of NaC2H3O2-3H2C
from a saturated solution. Do you think this value overestimates or underestimates the actual value?
Think about heat loss.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F579203f0-bd1c-4774-ac86-eb65259ca8df%2F78ce16b4-93d2-4b5f-a967-45584e30be9d%2Fwzi484y_processed.jpeg&w=3840&q=75)
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