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Calculate standard enthalpy of reaction,...

Calculate standard enthalpy of reaction,
`Fe_2O_3(s) + 3CO(g) to 2Fe(s) + 3CO_2(g)`,
from the following data.
`Delta_fH^0 (Fe_2O_3) = - 824 kJ//mol`,
`Delta_fH^0 (CO) = - 110 kJ //mol`,
`Delta_f H^0 (CO_2) = - 393 kJ //mol`

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`-25 kJ`
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