Using the bond enthalpy data given below, estimate the enthalpy of formation of gaseous isoprene
`CH_(2)=underset(CH_(3))underset(|)C-CH=CH_(2)`
`{:("Data","Bond enthalpy of",C-H"bond"=413.38KJmol^(-1),,),(,"Bond enthalpy of",C-C"bond"=347.69KJmol^(-1),,),(,"Bond enthalpy of",C=C"bond"=615.05 KJ mol^(-1),,):}`
Enthalpy of sublimation of carbon (graphite) `=718.39 KJ mol^(-1)`
Enthalpy of dissociation of `H_(2)(g)=435.97 KJ mol^(-1)`

Explanation

To estimate the enthalpy of formation of gaseous isoprene (C5H8) using the bond enthalpy data provided, we can follow these steps:

### Step 1: Identify the bonds in isoprene
The structure of isoprene is:
```
CH2
|
C
...