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Write an expression in the form of a chemical equation for standard enthalpy of formation,`Delta_(f)H^(@)` for CO.

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Write an expression in the form of a chemical equation for standard enthalpy of formation,`Delta_(f)H^(@)` for CO.
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`C(s)+(1)/(2)O_(2)(g)rarrCO(g) , Delta_(r)H=Delta_(f)H^(@)`
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