Entropy/free energy
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Define entropy
The dispersal of energy in a system
What is the symbol for entropy?
S
What is the unit of entropy?
Joules per Kelvin per mole (JK-1mol-1)
How could you predict the entropy change of a reaction?
• look out for change in mol of gas - look out for a change in state
From highest to lowest entropy, order the states of matter
gas solution liquid solid
How would entropy be affected if there was an increase in mol of gas?
increase in entropy
How would entropy be affected if there was a decrease in mol of gas?
decrease in entropy
Is an increase in entropy favoured?
Yes
Define sponteanous process
A process that is energetically possible
Define feasible process
A process that is energetically possible
Is standard entropy change always positive?
Yes
Define standard entropy
The entropy of one mole of a substance under standard conditions
What are standard conditions?
298K 100KPa
What is sign of ΔG for feasible processes?
-
What is the formula for Gibbs’ free energy?
ΔG= ΔH- TΔS
What are the units for Gibbs’ free energy (ΔG)?
kJmol-1
What are the units for ΔH?
kJmol-1
What must T be in to calculate ΔG?
K(elvin)
What must ΔS be converted from and to?
From J per K per mol to kJ per K per mol