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Given the following equations and DeltaH...

Given the following equations and `DeltaH^(@)` values, determine the enthalpy of reaction at 298 K for the reaction :
`C_(2)H_(4)(g)+6F_(2)(g) to 2HF_(4)(g)+4HF(g)`
`H_(2)(g)+F_(2)(g)to2HF(g)+2HF(g)," "DeltaH_(1)^(@)=-537" kJ"`
`C(s)+2F_(2)(g)toCF_(4)(g)," "DeltaH_(2)^(@)=-680" kJ"`
`2C(s)+2H_(2)(g)toC_(2)H_(4)(g)," "DeltaH_(3)^(@)=52" kJ"`

A

`-1165`

B

`-2486`

C

`+1165`

D

`+2486`

Text Solution

Verified by Experts

The correct Answer is:
B
`DeltaH^(@)=2xxDeltaH_(1)^(@)+2xxDeltaH_(2)^(@)-DeltaH_(3)^(@)`
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