bWhat is the enthalpy change if 3.1 g of chromium is oxidized to Cr₂O3(s)? AfH for Cr₂O3 (s) is -1134.7 kJ/mol Enthalpy change Submit Submit Answer kJ Try Another Version 10 item attempts remaining
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.
![Sure! Below is a transcription of the image content suitable for an educational website:
---
### Balancing Chemical Equations and Calculating Enthalpy Change
**Question a:**
Write a balanced chemical equation for the formation of 1 mol of \( \text{Cr}_2\text{O}_3(s) \) from Cr and \( \text{O}_2 \) in their standard states.
> **Instructions:** Be sure to specify states such as (aq) or (s). If a box is not needed, leave it blank. If no reaction occurs, leave all boxes blank and click on Submit.
**Balanced Equation:**
\[
2\text{Cr (s)} + \frac{3}{2} \text{O}_2 \text{(g)} \rightarrow \text{Cr}_2\text{O}_3 \text{(s)}
\]
**Status:** Correct
The equation of the formation of \( \text{Cr}_2\text{O}_3(s) \) from the elements:
\[
2 \text{Cr (s)} + \frac{3}{2} \text{O}_2 \text{(g)} \rightarrow \text{Cr}_2\text{O}_3 \text{(s)}
\]
---
**Question b:**
What is the enthalpy change if 3.1 g of chromium is oxidized to \( \text{Cr}_2\text{O}_3(s) \)?
> \(\Delta_f H^\circ\) for \( \text{Cr}_2\text{O}_3 \text{(s)} = -1134.7 \, \text{kJ/mol} \)
**Enthalpy Change:**
\[
\text{Enthalpy change} = \_\_\_ \, \text{kJ}
\]
**Options:**
- **Submit**
- **Submit Answer**
- **Try Another Version**
- **10 item attempts remaining**
*Controls:*
- Previous
- Next
- Email Instructor
- Save and Exit
---
This exercise involves balancing a chemical reaction and calculating the enthalpy change based on the given data. Ensure to input your calculations accurately to determine the enthalpy change.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff7ba9c54-af2b-48c5-8dd4-4f214c676725%2Fff79175e-f394-46ce-8024-ee4cad383109%2Ffsug4wg_processed.jpeg&w=3840&q=75)
Trending now
This is a popular solution!
Step by step
Solved in 3 steps with 3 images
