Thermodynamics Question 71

Question: The enthalpies of formation of Al2O3 and Cr2O3 are 1596kJ and 1134kJ respectively. ΔH for the reaction 2Al+Cr2O32Cr+Al2O3 is

[KCET 2003]

Options:

A) 2730kJ

B) 462kJ

C) 1365kJ

D) +2730kJ

Show Answer

Answer:

Correct Answer: B

Solution:

2Al+32O2Al2O3,ΔH=1596kJ …(i)

2Cr+32O2Cr2O3,ΔH=1134kJ …(ii)

By (i) . (ii) 2Al+Cr2O32Cr+Al2O3,ΔH=462kJ



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