A metal sample weighing 43.5 g and at a temperature of 100.0 °C was placed in 39.9 g of water in a calorimeter at 25.1 °C. At equilibrium the temperature of the water and metal was 33.5 °C. What was ΔT for the water? What was ΔT for the metal? Using the specific heat of water (4.184 J/g °C), calculate how much heat flowed into the water calculate the specific heat of the metal. What is the average specific heat capacity of the unknown metal in this experiment? What is the unknown metal?
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.
A metal sample weighing 43.5 g and at a temperature of 100.0 °C was placed in 39.9 g of water in a calorimeter at 25.1 °C. At equilibrium the temperature of the water and metal was 33.5 °C.
- What was ΔT for the water?
- What was ΔT for the metal?
- Using the specific heat of water (4.184 J/g °C), calculate how much heat flowed into the water
- calculate the specific heat of the metal.
- What is the average specific heat capacity of the unknown metal in this experiment?
- What is the unknown metal? Use Table 1 for reference.
TABLE 1 is at https://www.rsc.org/periodic-table
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