Enthalpy and Entropy Flashcards
what is entropy
the measure of disorder in a system
the more disorder there is the _____ the level of entropy
higher
what state has the lowest level of disorder
solids as they are arranged neatly in rows
how does number of particles affect entropy
if a reaction is in the same state but more moles are produced then entropy increases, there are more ways energy can be distributed
how is entropy calculated and what unit is used
delta S= entropy of products- entropy of the products
JK-1mol-1
what are the standard conditions for entropy
1 mole of a substance
100kPa
298K
what does Gibbs free energy tell us
whether a reaction is feasible or not
what is the calculation for Gibbs free energy
delta G= delta H- Tdelta S
delta H is enthalpy change (Jmol-1)
if a reaction is feasible delta G is
negative or zero
why might a reaction not occur event though reaction is feasible
activation energy is too high or rate of reaction is being very slow
how to calculate when a reaction is just feasible
delta G= 0
T= delta H/delta S
when doing Gibbs free energy remember to convert delta H from
kjmol-1 to jmol-1
