What is theheat of formation of C(6)H(6)...

What is theheat of formation of `C_(6)H_(6)`, given that the heats of combustion of benzene, carbon and hydrogen are 782, 94 and 68K. Cal respectively

`+14 K.Cal`

`-14 K.Cal`

`+28 K. Cal`

`-28 K.Cal `

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