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Determine the standard enthalpy of forma...

Determine the standard enthalpy of formation of isoprene(g) at 298K temperature. Given: at 298K,
`DeltaH^(0)(C-H)=413kJ*mol^(-1)`
`DeltaH^(0)(H-H)=436kJ*mol^(-1)`
`DeltaH^(0)(C-C)=346kJ*mol^(-1)`,
`DeltaH^(0)(C=C)=611kJ*mol^(-1)`,
`C("graphite, s")toC("graphite, g"),`
`DeltaH^(0)=717kJ*mol^(-1)`

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