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NH(3)(g)+3C1(2)(g)rarrNCL(3)(g)+3HC1(g)D...

`NH_(3)(g)+3C1_(2)(g)rarrNCL_(3)(g)+3HC1(g)DeltaH_(1)`
`N_(2)(g)+3H_(2)(g)rarr2NH_(3),DeltaH_(2)`
`H_(2)(g)+CL_(2)(g)rarr2HC1(g),DeltaH_(1)`
The heat of fomation of `NC1_(2)(g)` in the terms of `DeltaH_(1)` , `DeltaH_(2)` and `DeltaH_(3)` is

A

`DeltaH_(f)=-DeltaH_(1)+(DeltaH_(2))/(2)-(3)/(2)DeltaH_(3)`

B

`DeltaH_(f)=DeltaH_(1)+(DeltaH_(2))/(2)-(3)/(2)DeltaH_(3)`

C

`DeltaH_(f)=DeltaH_(1)-(DeltaH_(2))/(2)-(3)/(2)DeltaH_(3)`

D

None of the above

Text Solution

Verified by Experts

The correct Answer is:
B
`(1)/(2)N_(2)(g)+(3)/(2)Cl_(2)(g)rarrNCl_(3)(g)`
`DeltaH=-DeltaH_(1)+(DeltaH_(2))/(2)-(3)/(2)DeltaH_(3)`
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Given a. NH_(3)(g)+3CI(g)rarr NCI_(3)(g),3HCI(g),DeltaH_(1) b. N_(2)(g)+3H_(2)(g)rarr 2NH_(3)(g),DeltaH_(2) c. H_(2)(g)+CI_(2)(g)rarr 2HCI(g),DeltaH_(3) Express the enthalpy of formation of NCI_(3)(g)(Delta_(f)H^(Theta)) in terms of DeltaH_(1), DeltaH_(2) ,and DeltaH_(3) .

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A2Z-CHEMICAL THERMODYNAMICS-Work, Internal Energy And Enthalpy
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