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Use the bond energies in the table to es...

Use the bond energies in the table to estimate `DeltaH` for this reaction:
`CH_(2) = CH_(2) + Cl_(2) rarr CICH_(2) -CH_(2)CI`

A

`DeltaH=-684kJ`

B

`DeltaH=-154kJ`

C

`DeltaH=+89kJ`

D

`DeltaH=+177kJ`

Text Solution

Verified by Experts

The correct Answer is:
B
`DeltaH_("reaction")=sum(BE)_("reactants")-sum(BE)_("products")`
`=[(BE)_(C=C)+4(BE)_(C-H)+(BE)_(Cl-Cl)]-[4(BE)_(C-H)+2(BE)_(C-Cl)+(BE)_(C-C)]`
`=[(BE)_(C=C)+(BE)_(Cl-Cl)]-[2(BE)_(C-Cl)+(BE)_(C-C)]`
`=[612+243]-[2xx331+347]=-154kJ`
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