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The standard enthalpy of combustion of C...

The standard enthalpy of combustion of `C_(x)H_(y)(l)` at `25^(@)C` is Q `kJ*mol^(-1)`. Write down the thermochemical equation for the combustion reaction of this compound.

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The enthalpy of combustion of a compound is always negative. So, the standard enthalpy of combustion of the given compound, `DeltaH_(c)^(0)=-Q" "kJ*mol^(-1)`.
The thermochemical equation for this combustion reaction-
`C_(x)H_(y)(l)+(x+(y)/(4))O_(2)(g) to CO_(2)(g)+(y)/(2)H_(2)O(l),DeltaH_(c)^(0)=-Q" "kJ*mol^(-1)` .
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CHHAYA PUBLICATION-CHEMICAL THERMODYNAMICS-WARM UP EXERCISE
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