wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

The value of ΔfG0 for Cr2O3 is 540 kJ mol1 and that of Al2O3 is 827 kJ mol1. Is the reduction of Cr2O3 by Al is feasible reaction?

A
The data is incomlete
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
The reaction is feasible
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
The reaction is not feasible
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
The reaction may or may not be feasible
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B The reaction is feasible
The free energy of formation of alumina is more negative than Cr2O3 . According to thermodynamics if ΔG0, is more negative then reaction is more fealible.

Free energy of formation of Al2O3=827 kJ mol1
43Al+O223Al2O3 ΔGf=827 kJ mol1

Free energy of formation of Cr2O3=540 kJ mol1
So, 23Cr2O343Cr+O2 ΔGf=540 kJ mol1

Hence the free energy of reaction between Al and Cr2O3
2Al+Cr2O3Al2O3+2Cr
ΔG0=827+540=287 kJ mol
Hence the reaction is feasible.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Electrochemical Cell
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon