If a student used a sample of metal that was wet, several percent of the apparent mass of the metal would be water. Would you expect the resulting measured value of the heat capacity to be too high or too low? Explain.
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.
![Calorimetry of metals
Prelab
1. If a student used a sample of metal that was wet, several percent of the apparent mass of the
metal would be water. Would you expect the resulting measured value of the heat capacity to
be too high or too low? Explain.
2. A particular metal element, M, has a heat capacity of 0.36 J/g K, and it forms an oxide that
contains 2.90 g M per g 0.
a. Using the law of Dulong and Pettit (S x M = 25 J/ mol K), estimate the molar mass of the
metal M.
g/mol
b. From the composition of the oxide (2.90 g M/g O) and the molar mass of O, determine the
mass of M that combines with each moles of oxygen.
g M/ mol O
Use your estimate of the atomic mass form (a) and the information from (b) to determine the
empirical formula of the oxide.
C.
d. Now that you know the composition of the oxide and its formula, what is the accurate value of
the atomic mass of the metal M? What is the likely identity of M?
g/mol
identity](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F59563318-e81f-4792-a829-f4bd251b148d%2F282411c6-0cff-4639-961d-d9f5c78ee711%2Fejcgaao_processed.jpeg&w=3840&q=75)
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