Quiz 1 Preparation, Winter 2014, #9 and #12

Moderators: Chem_Mod, Chem_Admin

Posts: 21
Joined: Fri Sep 25, 2015 3:00 am

Quiz 1 Preparation, Winter 2014, #9 and #12

Postby 904564128 » Sat Jan 23, 2016 3:42 pm

Question 9 asks to calculate delta G for the balanced reaction. I obtained the correct numerical value, but my answer is in units of kJ instead of kJ/mol as the workbook's answer states. I have noticed this happening in several other calculations, but I thought that the moles canceled when you multiplied by the number of moles in the chemical equation. For example, question 12 requires you to find delta H and delta S, but the answers are all in units of kJ/mol. Could someone please explain this to me?

Posts: 18739
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 635 times

Re: Quiz 1 Preparation, Winter 2014, #9 and #12

Postby Chem_Mod » Sun Jan 24, 2016 6:42 pm

The units for those situations should be KJ or J for deltaG or deltaH

and KJ/K or J/K for deltaS

Unless they are asking you to find the entropy of vaporization for a general process for example (9.19 in the text).

Some of the solution manual units are off, but refer to the course reader or textbook examples for correct use of units.

Return to “Gibbs Free Energy Concepts and Calculations”

Who is online

Users browsing this forum: No registered users and 3 guests