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If DeltaG = -177K cal for " "(...

If `DeltaG = -177`K cal for `" "(1)2Fe(s)+(3)/(2)O_(2)(g) rarr Fe_(2)O_(3)(s)`
and `DeltaG =- 19` K cal for `" "(2)4Fe_(2)O_(3)(s)+ Fe(s) rarr 3Fe_(3)O_(4)(s)`
What is the Gibbs free energy of formation fo `Fe_(3)O_(4)(s)`?

A

`+ 229.6 (kcal)/(mol)`

B

`- 242.3 (kcal)/(mol)`

C

`- 727 (kcal)/(mol)`

D

`- 229.6 (kcal)/(mol)`

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