Solid fuel used in rocket is a mixture of Fe2 63 and Al (in ratio 1 : 2). The heat evolved (kJ) per gram of the mixture is_____(Nearest integer)
Given 
(A1 2 O 3 )= -1700 kJ mol -1
(Fe 2 O 3 )= -840 kJ mol -1
Molar mass of Fe, AI and O are 56, 27 and 16 g mol -1 respectively
Text Solution
Verified by Experts4
(4) Molten iron can be prepared by alumino thermite process as shown below.
Fe 2 O 3 + 2A1 
2Fe + A1 2 O 3
The iron oxide and aluminium metal ratio is 1 : 2 in the above reaction.
Now, the Enthalpy of the reaction is equal to the difference of enthalpy of formation of products to the enthalpy of formation of reactants.
= -1700+(840)
Ratio of Fe 2 O 3 and Al
= 160 : 54
= 2 96 in 214 gm mixture
=-4 kJ / gram
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