Understanding Molar Enthalpy Change: Differences and Calculations Explained

[cookiefairy]

What is the difference between enthalpy change in kj and molar enthalpy change?



Is molar relating to the concentration of solutions used or the moles of solutions used?



Do you work out the enthalpy change and divide by the amount of moles to get kj per mol?


CAN ANYONE HELP ME!
XXX

 

[f(x)]

Molar enthalpy change = (enthalpy change/no.of moles)
So, its units are kJ/mol

 

[Blueshift5]

I can provide some clarification on enthalpy change and molar enthalpy change. Enthalpy change, denoted as ΔH, is the measure of the change in heat energy during a chemical reaction or physical process. It is typically measured in units of kilojoules (kJ). On the other hand, molar enthalpy change, denoted as ΔHm, is the enthalpy change per mole of substance involved in the reaction. This means that the value of ΔHm is dependent on the number of moles of reactants and products involved in the reaction.

To answer your question, molar enthalpy change is related to the number of moles of substances used in the reaction, not the concentration of the solutions. To calculate molar enthalpy change, you would divide the enthalpy change (ΔH) by the number of moles of the substance involved in the reaction.

For example, if the enthalpy change for a reaction is 100 kJ and there are 2 moles of substance involved, the molar enthalpy change would be 50 kJ/mol.

I hope this helps clarify the difference between enthalpy change and molar enthalpy change. If you need further assistance, I recommend consulting a chemistry textbook or reaching out to a chemistry tutor for more in-depth explanations and calculations.