Draw the Lewis structure of HCN and then choose the appropriate formal charges for each of the atoms. H-C=N Click to edit molecule A) H = 0, C = 0, N = 0 B) H=0, C = -1, N = +1 C) H = 0, C = 0, N = -1 D) H = 0, C = 0, N = +1 E) H=+1, C = 0, N = -1
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.
![**Educational Resource: Understanding Lewis Structures and Formal Charges**
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**Activity: Drawing the Lewis Structure of HCN**
**Task:**
1. Draw the Lewis structure of HCN.
2. Choose the appropriate formal charges for each of the atoms in the molecule.
**Diagram:**
The diagram provided shows the Lewis structure of Hydrogen Cyanide (HCN):
```
H — C ≡ N
```
In this Lewis structure:
- Hydrogen (H) forms a single bond with Carbon (C).
- Carbon (C) forms a triple bond with Nitrogen (N).
**Options:**
You are provided with several options to select the correct formal charges for the atoms in HCN:
A) H = 0, C = 0, N = 0
B) H = 0, C = -1, N = +1
C) H = 0, C = 0, N = -1
D) H = 0, C = 0, N = +1
E) H = +1, C = 0, N = -1
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**Instructions:**
Review the Lewis structure and consider the rules for calculating formal charges. Determine the correct set of formal charges for Hydrogen (H), Carbon (C), and Nitrogen (N) in the HCN molecule.
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**Note:**
- Formal charge is calculated as follows:
\[ \text{Formal Charge} = (\text{Number of Valence Electrons}) - (\text{Number of Non-Bonding Electrons}) - \frac{(\text{Number of Bonding Electrons})}{2} \]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6895f9cd-8521-4c9a-bc62-df11c4ac3cae%2Ff8ea2faf-a39c-4945-8fbf-39631722c13e%2Fiwobrat_processed.jpeg&w=3840&q=75)
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