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Thermodynamics question

2023 · 11 Apr · Shift 1 · Q23
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  5. /2023 · 11 Apr · Shift 1 · Q23

Thermodynamics question

2023 · 11 Apr · Shift 1 · Q23

JEE MainChemistryThermodynamicsNumerical+4 / −1
Solid fuel used in rocket is a mixture of Fe2O3\mathrm{Fe}_{2} \mathrm{O}_{3}Fe2​O3​ and Al\mathrm{Al}Al(in ratio 1 : 2). The heat evolved (kJ)(\mathrm{kJ})(kJ) per gram of the mixture is ‾\underline{\hspace{2cm}}​. (Nearest integer) Given: ΔHfθ(Al2O3)=−1700 kJ mol−1ΔHfθ(Fe2O3)=−840 kJ mol−1\Delta \mathrm{H}_{\mathrm{f}}^{\theta}\left(\mathrm{Al}_{2} \mathrm{O}_{3}\right)=-1700 \mathrm{~kJ} \mathrm{~mol}^{-1}\Delta \mathrm{H}_{\mathrm{f}}^{\theta}\left(\mathrm{Fe}_{2} \mathrm{O}_{3}\right)=-840 \mathrm{~kJ} \mathrm{~mol}^{-1}ΔHfθ​(Al2​O3​)=−1700 kJ mol−1ΔHfθ​(Fe2​O3​)=−840 kJ mol−1 Molar mass of Fe, Al and O are 56, 27 and 16 g mol −1^{-1}−1 respectively.
Numerical answer
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