A student heating 32.6 g of metal until the temperature reaches 99.83 °C. The metal dropped into calorimeter contain 100 g of water at 23.62 °C. The final temperature reaches 24.41 °C. Calculate the specific calor of the metal if the specific heat of water 4.184 J/g °C (heat capacity of calorimeter ignored). b. By using the result from (a), determine the type of metal if the specific calor of chromium 0.460 J/g°C, molybdenum 0.250 J/g°C and tungsten 0.135 J/g°C. c. There is another student conducts the same experiment and use the data in question (a) by using heat capacity of calorimeter 410 J/°C, determine the type of metal used by the student by using data at question (b)
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. A student heating 32.6 g of metal until the temperature reaches 99.83 °C. The metal dropped into calorimeter contain 100 g of water at 23.62 °C. The final temperature reaches 24.41 °C. Calculate the specific calor of the metal if the specific heat of water 4.184 J/g °C (heat capacity of calorimeter ignored).
b. By using the result from (a), determine the type of metal if the specific calor of chromium 0.460 J/g°C, molybdenum 0.250 J/g°C and tungsten 0.135 J/g°C.
c. There is another student conducts the same experiment and use the data in question (a) by using heat capacity of calorimeter 410 J/°C, determine the type of metal used by the student by using data at question (b)
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