D. A sample of iron was heated to 125.0 °C, then placed into 375.0 g of water initially at 19.8 °C. The final temperature of both was 25.6 °C. How many grams of iron were in the sample? (need Table 4.3)
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.
![**Problem 20:**
A sample of iron was heated to 125.0 °C, then placed into 375.0 g of water initially at 19.8 °C. The final temperature of both was 25.6 °C. How many grams of iron were in the sample? (need Table 4.3)
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**1.** The specific heat of a human is approximately 3.47 J/g·°C and normal body temperature is 37.0 °C.
a. If a 165.0 lb person eats a candy bar containing 262.0 Cal, how much will their body temperature increase if all the calories from the candy bar are converted into heat energy? (hints: need to convert lbs to g, Cal to cal to J)
b. If a 165.0 lb person eats candy containing 25.0 Cal, how much will their body temperature increase if all the calories from the candy are converted into heat energy?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5ec3c097-3d53-4c30-ad9a-5708e013bfe8%2Fb0c97258-b113-49a7-b497-47bb72f9d649%2Fcudv6kl_processed.jpeg&w=3840&q=75)
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