For Practice 6.11 with feedback Part A Standard Thermodynamic Quantities for The

Question

For Practice 6.11 with feedback Part A Standard Thermodynamic Quantities for The thermite reaction, in which powdered aluminum reacts with chromium oxide, is highly exothermic. Selected Substances at 25 ° C Reactant AHe (kJ/mol) 2 Al(s) + Cr2O3(s) Al2O3(s) + 2 Cr(s) or product Al(s) Cr2O3(s)| -1139.7 Al2O3(s)| -1675.7 Cr(8) You may want to reference (pages 247-251) Use standard enthalpies of formation to find Hrxn for the thermite reaction Express your answer using one decimal place and include the appropriate units 0.0 0.0 Arn= 1 Value Units Section 6.9 while completing this problenm Submit My Answers Give Up

Explanation / Answer

(delta H0)exn = (delta Hfo)product - (delta Hfo)reactant
= 0 + (-1675.7) - {(-1139.7) + 0}
= -536 KJ

Answer : -536 KJ

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