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Q.

A mixture of the two oxides contains  FeO and Fe2O3  in the mole ratio 2:1, is changed into 1:2 mole ratio by oxidation of mixture. Then how much of heat (in Kcal) is released at constant pressure and temperature per mole of the initial mixture? Report your answer after dividing with 9. Given:

CompoundEnthalpy of formation (kcal/mol)
FeOs−65.0
Fe2O3(s)−175.0

 

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Detailed Solution

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2FeO+12O2Fe2O3;ΔH=(175)2(65)=45kcal

Initial2aa
Final2a2xa+x

2a2xa+x=12x=35a and heat released = 45x kcal

 Heat released per mole of initial mixture =45x3a=9kcal

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