How do I calculate the Gibbs free energy change for a reaction when given the entropy change, enthalpy change and the reaction conditions>

deltaG= Gibbs free energy 

deltaG=deltaH - TdeltaS 

If deltaH= 150 kJ/mol and deltaS=2.1 J/mol we must first convert the deltaS into kJ/mol, this is done by multiplying by 10-3 .

So deltaS= 2.1 x 10-3 kJ/mol. If the reaction is done at 25 degrees celcius, we must convert it to Kelvin, by adding 273. This gives 298 K. 

 

So the value of deltaG can be worked out:

 

deltaG= (150 kJ/mol) - (298) x( 2.1x 10-3

deltaG= 149. 4 kJ/mol 

 

Answered by Archit M. Chemistry tutor

9008 Views

See similar Chemistry A Level tutors

Related Chemistry A Level answers

All answers ▸

Give the IUPAC name for the following molecule and draw its displayed formula: CH3(CH2)3COOH


A compound, HOCH2CH2CH2CH2COCl, reacts with itself to give a new compound. Give the IUPAC name for the starting compound, draw the mechanism for the formation of the new compound and give the prominant feature of the IR spectrum of the new compound.


What 3 pieces of evidence disproved kekule's model? (6 marks)


Why are solutions of transition metal ions often coloured


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2024

Terms & Conditions|Privacy Policy
Cookie Preferences