The standard heat of formation, AH;, is defined as theenthalpy change for the formation of one mole ofPart Bsubstance from its constituent elements in theirstandard states. Thus, elements in their standard stateshave AH: = 0. Heat of formation values can be usedThe combustion of ethene, C2H4, occurs via the reactionto calculate the enthalpy change of any reaction.C2H4 (g) + 302 (g)→2CO2(g) + 2H20(g)Consider, for example, the reactionwith heat of formation values given by the following table:2NΟ (5) + Ο, (s) 2ΝO, (g)ΔΗρ(kJ/mol)Substancewith heat of formation values given by the followingtable:C2H4 (g)52.47CO2 (g)-393.5Substance(kJ/mol)H2O(g)-241.8NO(g)90.2Calculate the enthalpy for the combustion of ethene.02 (g)Express your answer to four significant figures and include the appropriate units.NO2(g)33.2• View Available Hint(s)Then the heat of formation for the overall reaction isΔΗ ΔΗ (products) -ΔΗ; (reactants )[2(90.2) + 0]HA?2(33.2)-114 kJ/molAHen =ValueUnits

Heat of formation (in KJ/mol) C2H4 = 52.47 CO2 = -393.5 H2O = -241.8 Heat of combustion of ethene = ?

The combustion of ethene, C2 H4, occurs via the reaction C2H4 (g) + 302(g)→2CO2(g) + 2H20(g) with heat of formation values given by the following table: AH (kJ/mol) Substance C2H4 (g) 52.47 CO2(g) -393.5 H2O(g) -241.8 Calculate the enthalpy for the combustion of ethene. Express your answer to four significant figures and include the appropriate units. • View Available Hint(s) HA ? AHm = Value Units

The combustion of ethene, C2 H4, occurs via the reaction C2H4 (g) + 302(g)→2CO2(g) + 2H20(g) with heat of formation values given by the following table: AH (kJ/mol) Substance C2H4 (g) 52.47 CO2(g) -393.5 H2O(g) -241.8 Calculate the enthalpy for the combustion of ethene. Express your answer to four significant figures and include the appropriate units. • View Available Hint(s) HA ? AHm = 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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