Solid fuel used in rocket is a mixture of Fe2O3 and Al (in ratio 1: 2). The heat evolved (kJ) per gram of the mixture is _______ (Neatest integer)
Given: 
∆HΘf  (Al2O3) = -1700 kJ mol-1
∆HΘf  (Fe2O3) = -840 kJ mol-1
Molar mass of Fe, Al and O are 56, 27 and 16 g mol-1 respectively.

Answer: 4
Solution:
The reaction would be.

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