Part B: Mass of calorimeter = 3.297 g Mass of calorimeter and water = 51.540 g Mass of unkown sample = 5.059 g Initial temperature of water = 19.3 °C Final temperature of water = 26.0 °C
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.
What is the mass of the water used?
What is the total mass of the solution? (water+salt)
What is the temperature change of the solution? Remember to use the correct sign of delta T. A temperature increase is positive. A temperature decrease is negative.
Calculate the energy absorbed or released by the solution using the temperature change calculated. Use the mass of water plus solid. Assume the same specific heat as water (4.18J/gC). Use the correct sign for q (same sign as the temperature change).
Using the answer above and the mass of unknown, calculate the enthalpy of solution per gram for the unknown? Be sure to use the correct sign.
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