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.
![**Text Transcription:**
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**How much energy in kilocalories is needed to vaporize 625 g of water? The heat of vaporization of water is 540 cal/g.**
[ ] kcal
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**Explanation:**
This text presents a problem that requires calculating the energy needed to vaporize a given amount of water.
- **Problem Statement:** You need to determine the energy in kilocalories (kcal) to vaporize 625 grams of water.
- **Given Data:**
- Mass of water = 625 grams
- Heat of vaporization = 540 calories per gram
**Calculation Steps:**
To find the energy required in kilocalories, follow these steps:
1. **Calculate Total Calories:** Multiply the mass of water by the heat of vaporization.
\[
\text{Total calories} = 625 \, \text{g} \times 540 \, \frac{\text{cal}}{\text{g}}
\]
2. **Convert Calories to Kilocalories:** Divide the total calories by 1000 (since 1 kilocalorie = 1000 calories).
This problem provides an opportunity to apply knowledge of phase changes and energy conversion in physics or chemistry.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Faed2933e-b67f-42a0-9fac-b6dce0e828b0%2F9c6d5fb4-3658-49d0-aba5-5dd2113c5cb3%2F6zg9mx_processed.jpeg&w=3840&q=75)
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