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# How to prove that this sentence is true (phys chem) watch

1. 'At equilibrium, the chemical potential of a component in the vapour must be the same as the chemical potential of that component in the fluid'

It also says that assume the Gibbs energy of a closed system at constant T and p is a minimum at equilibrium.

Just stuck on where to start or if it's easier than I think it is?
Thanks for any help
2. (Original post by RoseBrilliante)
'At equilibrium, the chemical potential of a component in the vapour must be the same as the chemical potential of that component in the fluid'

It also says that assume the Gibbs energy of a closed system at constant T and p is a minimum at equilibrium.

Just stuck on where to start of if it's easier than I think it is?
Thanks for any help
If the chemical components aren't the same then it won't be in equilibrium. If vapour is produced at a quicker rate than liquid then it isn't equilibrium

I think
3. (Original post by The Wavefunction)
If the chemical components aren't the same then it won't be in equilibrium. If vapour is produced at a quicker rate than liquid then it isn't equilibrium

I think
That's what I thought but I think they want me to use an equation of some sort?
It also says 'change in Gibbs energy on moving Δn moles from phase α to phase β is given by ΔG = Δn[μ(β) - μ(α)]'
4. (Original post by RoseBrilliante)
That's what I thought but I think they want me to use an equation of some sort?
It also says 'change in Gibbs energy on moving Δn moles from phase α to phase β is given by ΔG = Δn[μ(β) - μ(α)]'
Christ, I haven't got a clue there, sorry. Thermodynamics not really my strong suit. What level is this?
5. (Original post by The Wavefunction)
Christ, I haven't got a clue there, sorry. Thermodynamics not really my strong suit. What level is this?
Oh right no worries, bit of a long shot asking on here to be honest: it's 2nd year undergrad!
6. (Original post by RoseBrilliante)
Oh right no worries, bit of a long shot asking on here to be honest: it's 2nd year undergrad!
Ah right I'm in my second year too, and I haven't done thermodynamics this year! Starts next week, unfortunately
Yeah, you'll be lucky to get any answers to anything above A-level on here
7. At equilibrium, dG/dn = 0 (it's a minimum at equilibrium) so μA - μB = 0, μA = μB
8. what's the difference between gas and vapour?

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