Unknown metal mass of metal 50.611g temp of boiling water 97 C volume of water in cup 50mL temp of water in cup 24.4 C final temp of system 31.1 C * 4.18 J/gK specific heat capacity *16.1 J/C Ccalorimeter 1. Calculate heat gained by water in calorimeter (qwater) after adding unknown metal. 2. Calculate heat gained by calorimeter (qcalorimeter) after adding unknown metal. 3. From 1 and 2, calculate heat lost by unknown metal (qmetal) 4. Calculate specific heat capacity of unknow metal in (J/gK)
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.
| Unknown metal | |
| mass of metal | 50.611g |
| temp of boiling water | 97 C |
| volume of water in cup | 50mL |
| temp of water in cup | 24.4 C |
| final temp of system | 31.1 C |
* 4.18 J/gK specific heat capacity
*16.1 J/C Ccalorimeter
1. Calculate heat gained by water in calorimeter (qwater) after adding unknown metal.
2. Calculate heat gained by calorimeter (qcalorimeter) after adding unknown metal.
3. From 1 and 2, calculate heat lost by unknown metal (qmetal)
4. Calculate specific heat capacity of unknow metal in (J/gK)
5. Use the law of Dulong and Petit to calculate approximate molar mass of metal
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