4.2 Enthalpy, Entropy and Free Energy Flashcards
1
Q
Entropy, S (J K⁻¹ mol⁻¹)
A
A measure of the disorder or randomness of a system.
2
Q
Standard Entropy, Sᶱ
A
The entropy content of one mole of a substance under standard conditions (298K and 1 atm pressure) and in standard state.
3
Q
Feasable Reaction
A
A reaction in which ΔG < 0.
4
Q
Hess’ Law
A
The total enthalpy change of a reaction is independent of route taken, provided that initial and final conditions are the same.
5
Q
Entropy Change, ΔSᶱ
A
ΔSᶱ = ΣSᶱ ᵖʳᵒᵈᵘᶜᵗˢ - ΣSᶱ ʳᵉᵃᶜᵗᵃⁿᵗˢ
The sum of entropies of products minus the sum of entopies of reactants understandard conditions.
6
Q
Standard Free Energy Change, ΔGᶱ (kJ mol⁻¹)
A
The standard free energy change is used to deduce wethetr or ont a reaction is feasable
ΔGᶱ = ΔHᶱ - TΔSᶱ
