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For the reaction N(2)+3X(2) to 2NX(3) wh...

For the reaction `N_(2)+3X_(2) to 2NX_(3)` where X=F, Cl (the average bond energies are F-F = 155 kJ `"mol"^(-1)` N-F = 272 kJ `"mlo"^(-1)`, Cl-Cl = 242 kJ `"mol"^(-1)`, N-Cl= 200 kJ `"mol"^(-1) and N -=N = 941 kJ "mol"^(-1)`), the heats of formation of `NF_(3) and NCl_(3)` in kJ `"mol"^(-1)`, respectively, are closest to

A

`-226 and +467`

B

`+226 and -467`

C

`-151 and +311`

D

`+ 151 and -311`

Text Solution

Verified by Experts

The correct Answer is:
A
`N_(2)+3X_(2) to 2NX_(3)`
`N_(2)+3F_(2) to 2NF_(3)`
`DeltaH_(NF_(3))=941+3(155)-6(272)=-226`
`DeltaH_(NCl_(3))=941+3(242)-6(200)=+467`
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