Home
Class 12
CHEMISTRY
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

Text Solution

Verified by Experts

The correct Answer is:
B
`DeltaG^(@)` for `3Fe(s) + 2O_(2)(g) rarr Fe_(3)O_(4)(s)` can be obtained by taking
`[(2) + 4 xx (1)] xx (1)/(3)`
Hence , we get `DeltaG_(f) =[-19 + 4 xx (-177)] xx (1)/(3)=-242.3 K " cal for " 1 mol Fe_(3)O_(4)`
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    RESONANCE|Exercise exercise-3 Part:(III) : Match the column|3 Videos

  • THERMODYNAMICS

    RESONANCE|Exercise exercise-2 Part:(I) :Only one option correct|18 Videos

  • THERMODYNAMICS

    RESONANCE|Exercise exercise-3 Part-3 :(Only one option correct type) section B|12 Videos

  • TEST SERIES

    RESONANCE|Exercise CHEMISTRY|50 Videos

Similar Questions

Explore conceptually related problems

If DeltaG=-177 kcal for " "(1)2Fe(s)+(3)/(2)O_(2)toFe_(2)O_(3)(s) and DeltaG=-19 k cal for " "(2)4FeO_(3)(s)+Fe(s)to3Fe_(3)O_(4)(s) What is the Gibbs free energy of formation of Fe_(3)O_(4) ?

Given: i. 2Fe(s) +(3)/(2)O_(2)(g) rarr Fe_(2)O_(3)(s), DeltaH^(Theta) =- 193.4 kJ ii. Mg(s) +(1)/(2)O_(2)(g) rarr MgO(s), DeltaH^(Theta) =- 140.2kJ What is DeltaH^(Theta) of the reaction? 3Mg +Fe_(2)O_(3)rarr 3MgO +2Fe

Fe_(2)O_(3) (S) + 2AI (s) to 2Fe(l) + AI_(2)O_(3)(s) + Heat . This reaction is called .

Fe(s)+H_(2)O(l) overset(Boil) to Fe_(3)O_(4)+H_(2)uarr

EAN of Fe in [Fe(C_(2)O_(4)_(3)]^(3-) is .

The heat of formation of Fe_(2)O_(3)(s) is -824.0 kJ.What will be the Delta H for thereaction: 2Fe_(2)O_(3)(s) to 4Fe(s) + 3O_(2)(g)