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The question in the image asks:  
**"What kind of intermolecular forces act between an iron(III) cation and an ammonia molecule?"**

Intermolecular forces between an iron(III) cation (\( \text{Fe}^{3+} \)) and an ammonia molecule (\( \text{NH}_3 \)) would likely include:

1. **Ion-Dipole Forces**:  
   The iron(III) ion (\( \text{Fe}^{3+} \)) is a cation, and ammonia is a polar molecule with a permanent dipole. The positive charge of the iron cation will attract the negative (lone pair) end of the dipole in ammonia.
   
2. **Hydrogen Bonding** (indirect):  
   Ammonia has hydrogen bonding due to the nitrogen atom's lone pair and its hydrogen atoms, although this bonding does not directly involve the iron cation.

Therefore, the primary intermolecular force between the iron(III) cation and ammonia is **ion-dipole interactions**.

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Here are five related questions that can expand on this information:
1. What other cations would also exhibit ion-dipole interactions with ammonia?
2. How does the strength of the ion-dipole force change with different cation charges?
3. Why does ammonia act as a polar molecule in this context?
4. Can ammonia donate its lone pair to the iron(III) ion, forming a coordination complex?
5. How does hydrogen bonding differ from ion-dipole forces in terms of strength and behavior?

**Tip:** Ion-dipole forces are generally stronger than dipole-dipole interactions due to the full charge of the ion compared to the partial charges in dipoles.

What kind of intermolecular forces act between an iron(III) cation and an ammonia molecule?

Explore the intermolecular forces between an iron(III) cation and an ammonia molecule, including ion-dipole interactions and hydrogen bonding. Suitable for advanced chemistry students.

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