Question

Calculate the entropy change for the reaction: Fe2O3(s) + 2Al(s) -> Al2O3(s) + 2Fe(s)

Entropy data:
Fe2O3(s): 90 J/K mol
Al(s): 28.3 J/K mol
Al2O3(s): 51 J/K mol
Fe(s): 27.2 J/K mol

Answer 1

ΔSº= -41,2 J/molK

Step-by-step explanation:

For a general equation aA +bB → cC + dD

ΔSº= c*SºC + d*SºD - a*SºA - b*SºB

ΔSº= SºAL2O3 + 2SºFe - SºFe2O3 - 2SºAl = (51 + 54.4 - 90 - 56.6)J/molK = -41,2 J/molK