Part B Calculate the enthalpy change for the thermite reaction: 2Al(s) + Fe2O3 (s)→2FE(s)+ Al½O3 (s), A;H° = –850. kJ when 168 g of Al undergoes the reaction with a stoichiometrically equivalent amount of Fe2 O3. Express your answer to three significant figures and include the appropriate units. • View Available Hint(s) HA Value Units

Part B Calculate the enthalpy change for the thermite reaction: 2Al(s) + Fe2O3 (s)→2FE(s)+ Al½O3 (s), A;H° = –850. kJ when 168 g of Al undergoes the reaction with a stoichiometrically equivalent amount of Fe2 O3. Express your answer to three significant figures and include the appropriate units. • View Available Hint(s) HA Value Units

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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How much did our sodium-in-water demonstration raise the temperature of water in the dessicator jar? The reaction we performed was: Na(s) + H2O(l) NaOH(aq) + 1/2H2(g) qreaction = rHo = -184 kJ/mol-rxn Assuming the dessicator jar is well insulated (like our coffee-cup calorimeter), the energy balance is: 0 = qsystem = qreaction + qwater qreaction = -qwater qreaction = -mwater*Cwater*Twater The data from the demonstration was: (a) 1.0 kg water, (b) 22.0oC, (d) Cwater = 4.18 J/g-K, (e) mNa = 0.21 g How many moles of sodium were added to the water (in moles)?
（1）Consider the reaction: 2A (g) + 3 B (g) → 2 C (g) ΔHrxn = +254.3 kJ What will be the enthalpy change (in kJ) if 0.471 mol B reacts in excess A? （2）Consider the reaction: C (s) + O2 (g) → CO2 (g) ΔHrxn = -393.5 kJ What mass of carbon (in g) must be reacted via this mechanism to release 581.2 kJ of heat?
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