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Calculate the standard enthalpy of react...

Calculate the standard enthalpy of reaction for the following reaction using the listed enthalpies of reaction :
`3Co(s)+2O_(2)(g)rarrCo_(3)O_(4)(s)`
`2 Co(s)+O_(2)(g)rarr2CoO(s)," "DeltaH_(1)^(@)=-475.8 kJ`
`6CoO(s)+O_(2)(g)rarr2Co_(3)O_(4)(s),DeltaH_(2)^(@)=-355.0 kJ`

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