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  • 7 June 2024
    Helena Van Lindert
    R2 (HL) Equilibrium (2)
    Dear Geoffrey, On pg. 102 of your excellent IB guide, I may be mistaken, but reading under Gibbs energy change and equilibrium constant' , but if Q is 0 lnQ=1, does that not make DG= DG(Standard) + RT, instead of DG= DG(Standard). Kind...
  • Thank you for spotting this Radhika - I've corrected it now.
  • In q 4  hcl is limiting so hydrogen should be half of mole of hcl..?
  • 5 June 2024
    Geoffrey Neuss
    R1.1 Measuring energy changes
    Hello Xiaodan, I think you have put it very well and are correct. Students intuitively realise that energy needs to be put in to break a chemical bond but it is less obvious that the same amount of energy is given out when the same bond is...