Homework Answers
The Bond Enthalpy is the energy required to break a chemical bond. The average bond enthalphy values of C-H, C-N, C=C and N-H bonds are 413, 293, 614 and 391 kJ mol-1,
Herein, 1 C-H bonds has broken.
1 N-H bond has broken
and 1 N-H and one c=c bonds are formed.
ΔH = ∑ ΔH(bonds broken) - ∑ ΔH(bonds formed) = 413 + 293 - 391 -614 = - 299 kJ mol-1
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a. Estimate the gas phase enthalpy change using bond dissociation enthalpies from the OWL Table Reference, not data from...
a. Estimate the gas phase enthalpy change
using bond dissociation enthalpies from the OWL Table
Reference, not data from your text. Click the
References button and then click the
Tables link on the drop-down that appears. Include
algebraic sign and units.
b. Is the reaction exothermic or
endothermic?
c. Is the reaction likely to proceed
spontaneously in the direction written?
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Bond Enthalpies CHM113 Chapter 8 Resource Worksheets AH AH,+AH2 Resource 5: Bond Enthalpies 1. Estimate the...
Bond Enthalpies
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Using bond enthalpies given in the following table, determine
the change in enthalpy (H) for the decomposition of 2 moles of
ammonia in the gas phase to its constituent elements. Show your
work. 2NH3(g)-->N2(g)+3H2(g)
Question 16 (4 points) Using bond enthalpies given in the following table, determine the change in enthalpy (H) for the decomposition of 2 moles of ammonia in the gas phase to its constituent elements. Show your work. 2 NH3(g) >N2(g) + 3 H2(g) Bond Bond enthalpy...
a. Estimate the gas phase enthalpy change
using bond dissociation enthalpies from the OWL Table
Reference, not data from your text. Click the
References button and then click the
Tables link on the drop-down that appears. Include
algebraic sign and units.
b. Is the reaction exothermic or
endothermic?
c. Is the reaction likely to proceed
spontaneously in the direction written?
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