Solid fuel used in rocket is a mixture of and Al (in ratio 1 : 2). The heat evolved (kJ) per gram of the mixture is (Nearest integer).

Given: ,

Molar mass of Fe, Al and O are 56, 27 and 16 respe

Question

Solid fuel used in rocket is a mixture of  and Al (in ratio 1 : 2). The heat evolved (kJ) per gram of the mixture is  (Nearest integer).

Given: ,

Molar mass of Fe, Al and O are 56, 27 and 16  respectively.

Canvas Classes · Accepted Answer

Strategy:
 Calculate the enthalpy of the thermite reaction using formation energies, then determine the heat released per gram of the specified reactant mixture.

Step 1: Calculate 
Reaction: 
.

Step 2: Calculate Molar Mass of Mixture
Reaction uses  () and  ().
Total mass .

Step 3: Calculate Heat per gram
.
Nearest integer: .

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