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

ΔSº= -41,2 J/molK

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

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.

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