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help! dont know where to start 20. The standard enthalpy of formation of hematite, Fe2O3(s), is 825.5kJmol1. What is the standard enthalpy of reaction for
help! dont know where to start 
20. The standard enthalpy of formation of hematite, Fe2O3(s), is 825.5kJmol1. What is the standard enthalpy of reaction for the reduction of hematite with carbon monoxide to give metallic iron as shown below? CO(g)+1/2O2(g)CO2(g)Fe2O3(s)+3CO(g)2Fe(s)+3CO2(g)Hrxn=283.0kJmol1Hrxn=???(B)542.5kJml1 (A) 23.5kJmol1 (B) 542.5kJmol4 (C) 849.0kJmol1 (D) 1674.5kJmol1 Step by Step Solution
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Modern Chemistry
Authors: RINEHART AND WINSTON HOLT
Student Edition 2007
9780030922046, 0030922046
