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Calculate the enthalpy of combustion of ...

Calculate the enthalpy of combustion of glucose from the follwoing data :
`C("graphite") +O_(2)(g) to CO_(2)(g)`
`Delta_(r)H^(@) = -395.0 kJ`
`H_(2)(g) + 1/2 O_(2)(g) to H_(2)O(l)`
`Delta_(r)H^(@) = - 269.4 kJ`
`6C("graphite") + 6H_(2)(g) + 3O_(2)(g) to C_(6)H_(12)O_(6)(s)`
`Delta_(r)H^(@) = -1169.9 kJ`

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