The same quantity of energy is added to 10.00 g pieces of gold, magnesium, and platinum, all initially at 25°C. The molar heat capacities (cp) of these three metals are 25.41 J/(mol•°C), 24.79 J/(mol•°C), and 25.95 J/(mol•°C), respectively. Which of the following answers best describes the final temperatures of the three metals?
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.
The same quantity of energy is added to 10.00 g pieces of gold, magnesium, and platinum, all initially at 25°C.
The molar heat capacities (cp) of these three metals are 25.41 J/(mol•°C), 24.79 J/(mol•°C), and 25.95 J/(mol•°C), respectively.
Which of the following answers best describes the final temperatures of the three metals?
Choose one:
A. Platinum will have the highest final temperature because it has the highest molar heat capacity.
B. Gold will have the highest final temperature because it has the lowest heat capacity.
C. The three metals will all have the same final temperature because the same quantity of heat was added to identical masses of each.
D. Magnesium will have the highest final temperature because it has the lowest molar heat capacity.
E. Magnesium will have the highest final temperature because it has the highest heat capacity.
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