Standard enthelphy change and hybridisation

[crays]

Hi guys, here i have two question, but i don't understand the answer at all.

For the standard enthalphy change question 5) b) i) shouldn't it be standard enthalphy change = Product - Reactant? But from the answer it was given as reactant - product.

For question number 8, i don't understand why Fe²⁺ still has 6 valence electrons, shouldn't it be 4?

 

[crays]

Any help please?

 

[Blueshift5]

Hello,

Thank you for your questions regarding standard enthalpy change and hybridization. Let me explain the answers to your questions in more detail.

First, for question 5) b) i), the standard enthalpy change is defined as the difference between the enthalpy of the products and the enthalpy of the reactants. In other words, it is the change in energy that occurs during a chemical reaction. Therefore, the correct equation for standard enthalpy change is indeed Product - Reactant. It is possible that there was a mistake in the answer provided to you.

For question number 8, the number of valence electrons in Fe2+ is indeed 4. However, when we talk about hybridization, we are referring to the mixing of atomic orbitals to form new hybrid orbitals. In this case, the Fe2+ ion would have 6 valence electrons in its hybrid orbitals, as it is in the +2 oxidation state and has lost two electrons. This does not change the overall number of valence electrons in the ion, but it does affect the arrangement of those electrons in the hybrid orbitals.

I hope this clarifies your questions. Please let me know if you have any further inquiries. Thank you for your interest in science.