The heat of combustion of hydrocarbon C(...

The heat of combustion of hydrocarbon `C_(x)H_(y)` is ''a'' calories and heat of formation of `CO_(2) and H_(2)O` are ''b'' and 'c' calories respectively then the heat of formation of hydrocarbon `C_(8)H` is (in calories)

A

`xa + yc-b`

B

`xb + yc-a`

C

`b+xc -xa`

D

`xb + (y)/(2) c-a`

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