A sample of solid iron is heated with an electrical coil. If 93.3 Joules of energy are added to a 14.7 gram sample initially at 21.0°C, what is the final temperature of the iron? Answer: °C.
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.
![### Heating Solid Tin: Calculating Initial Temperature
**Question:**
A sample of solid tin is heated with an electrical coil. If 27.8 Joules of energy are added to a 10.6 gram sample and the final temperature is 37.3°C, what is the initial temperature of the tin?
**Answer:** __ °C
**Explanation:**
To find the initial temperature of the tin, you can use the formula for heat transfer in a substance:
\[ q = mc\Delta T \]
where:
- \( q \) is the heat energy (27.8 Joules),
- \( m \) is the mass of the tin (10.6 grams),
- \( c \) is the specific heat capacity of tin (about 0.227 J/g°C for solid tin),
- \( \Delta T \) is the change in temperature (\( T_{final} - T_{initial} \)).
Rearranging for \( T_{initial} \):
\[ T_{initial} = T_{final} - \frac{q}{mc} \]
Substitute the given values:
\[ T_{initial} = 37.3°C - \frac{27.8 \text{ J}}{10.6 \text{ g} \times 0.227 \text{ J/g°C}} \]
Calculate \( T_{initial} \) and fill in the answer in the box provided.
Note: Ensure to perform the calculation and provide the numeric answer in place of "__".](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F216d8975-823a-443e-8abc-06f056adfa09%2F2bbb7d9a-88d7-4881-beab-36a7722bd0d4%2F0pdqq1d_processed.png&w=3840&q=75)
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