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
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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The standard heat of formation, AH;, is defined as the
enthalpy change for the formation of one mole of
Part B
substance from its constituent elements in their
standard states. Thus, elements in their standard states
have AH: = 0. Heat of formation values can be used
The combustion of ethene, C2H4, occurs via the reaction
to calculate the enthalpy change of any reaction.
C2H4 (g) + 302 (g)→2CO2(g) + 2H20(g)
Consider, for example, the reaction
with heat of formation values given by the following table:
2NΟ (5) + Ο, (s) 2ΝO, (g)
ΔΗρ
(kJ/mol)
Substance
with heat of formation values given by the following
table:
C2H4 (g)
52.47
CO2 (g)
-393.5
Substance
(kJ/mol)
H2O(g)
-241.8
NO(g)
90.2
Calculate 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 is
ΔΗ ΔΗ (products) -ΔΗ; (reactants )
[2(90.2) + 0]
HA
?
2(33.2)
-114 kJ/mol
AHen =
Value
Units
Transcribed Image Text:The standard heat of formation, AH;, is defined as the enthalpy change for the formation of one mole of Part B substance from its constituent elements in their standard states. Thus, elements in their standard states have AH: = 0. Heat of formation values can be used The combustion of ethene, C2H4, occurs via the reaction to calculate the enthalpy change of any reaction. C2H4 (g) + 302 (g)→2CO2(g) + 2H20(g) Consider, for example, the reaction with heat of formation values given by the following table: 2NΟ (5) + Ο, (s) 2ΝO, (g) ΔΗρ (kJ/mol) Substance with heat of formation values given by the following table: C2H4 (g) 52.47 CO2 (g) -393.5 Substance (kJ/mol) H2O(g) -241.8 NO(g) 90.2 Calculate 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 is ΔΗ ΔΗ (products) -ΔΗ; (reactants ) [2(90.2) + 0] HA ? 2(33.2) -114 kJ/mol AHen = Value Units
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