For the reaction below: a. Estimate the gas phase enthalpy change using bond dis

Question

For the reaction below:

a. Estimate the gas phase enthalpy change using bond dissociation enthalpies from the OWL Table Reference, not data from your text. Click the Referencesbutton and then click the Tables link on the drop-down that appears. Include algebraic sign and units.

b. Is the reaction exothermic or endothermic? _________(exo/endo/neither)

c. Is the reaction likely to proceed spontaneously in the direction written? _________(yes/no/uncertain)

~~~~~~

For the reaction below:

a. Estimate the gas phase enthalpy change using bond dissociation enthalpies from the OWL Table Reference, not data from your text. Click the Referencesbutton and then click the Tables link on the drop-down that appears. Include algebraic sign and units.

b. Is the reaction exothermic or endothermic? _________ (exo/endo/neither)

c. Is the reaction likely to proceed spontaneously in the direction written? _________ (yes/no/uncertain)

~~~~~~

For the reaction below:

a. Estimate the gas phase enthalpy change using bond dissociation enthalpies from the OWL Table Reference, not data from your text. Click the Referencesbutton and then click the Tables link on the drop-down that appears. Include algebraic sign and units.

b. Is the reaction exothermic or endothermic? _________(exo/endo/neither)

c. Is the reaction likely to proceed spontaneously in the direction written? _________(yes/no/uncertain)

Comment

For the reaction below: a. Estimate the gas phase enthalpy change using bond dissociation enthalpies from the OWL Table Reference, not data from your text. Click the Referencesbutton and then click the Tables link on the drop-down that appears. Include algebraic sign and units. b. Is the reaction exothermic or endothermic? _________(exo/endo/neither) c. Is the reaction likely to proceed spontaneously in the direction written? _________(yes/no/uncertain) ~~~~~~ For the reaction below: a. Estimate the gas phase enthalpy change using bond dissociation enthalpies from the OWL Table Reference, not data from your text. Click the Referencesbutton and then click the Tables link on the drop-down that appears. Include algebraic sign and units. b. Is the reaction exothermic or endothermic? _________ (exo/endo/neither) c. Is the reaction likely to proceed spontaneously in the direction written? _________ (yes/no/uncertain) ~~~~~~ For the reaction below: a. Estimate the gas phase enthalpy change using bond dissociation enthalpies from the OWL Table Reference, not data from your text. Click the Referencesbutton and then click the Tables link on the drop-down that appears. Include algebraic sign and units. b. Is the reaction exothermic or endothermic? _________(exo/endo/neither) c. Is the reaction likely to proceed spontaneously in the direction written? _________(yes/no/uncertain) Comment

Explanation / Answer

H = Ebonds broken + Ebonds formed

Ebonds broken always a positive value

Ebonds formed always a negative value

1. a.

H = Ebonds broken + Ebonds formed

=(EC-H ) + (-EO-H)

= 413 +(-463)

= -50 kJ/mol

b. exothermic as is H negative.

c. Uncertain. You cannot say that from dH value only. To predict if reaction will proceed spontaneously or not you have to determine dG. If dG id -Ve reaction is spontaneous.

2.a.

H = Ebonds broken + Ebonds formed

=(EC-H ) + (-EH-Cl)

= 413 +(-432)

= -19 kJ/mol

b. exothermic

c. Uncertain. You cannot say that from dH value only.

3a.

H = Ebonds broken + Ebonds formed

=(EC-H +EBr-Br ) + (-EC-Br - EH-Br )

= (413 +193)+(-285-366)

= -45 kJ/mol

b. exothermic

c. Uncertain. You cannot say that from dH value only.

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