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Use the given standard enthalpies of for...

Use the given standard enthalpies of formation (in kJ/mol) to determine the enthalpy of reaction of the following reaction :
`NH_(3)(g)+3F_(2)(g)rarrNF_(3)+3HF(g)`
`DeltaH_(f)^(@)(NH_(3),g)=-46.2, " "DeltaH_(f)^(@)(NF_(3),g)=-113.0 ," "DeltaH_(f)^(@)(HF, g)=-269.0`

A

`-335.8 kJ//mol`

B

`-873.8 kJ//mol`

C

`-697.2 kJ//mol`

D

`-890.4 kJ//mol`

Text Solution

Verified by Experts

The correct Answer is:
B
`Delta_(r )H=(Delta_(f)H)_(P)-(Delta_(f)H)_(R)`
`Delta_(r )H=-113 + 3xx(-269)+46.2 =-873.8 " kJ"`
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