Enthalpy of Formation of a Radical The free radical ClO is intimately involved i

Question

Enthalpy of Formation of a Radical The free radical ClO is intimately involved in reactions that lead to the destruction of ozone in the stratosphere. Given that a chlorine-oxygen bond in ClO_2(g) has an enthalpy of 243 kJ/mol, an oxygen-oxygen bond has an enthalpy of 498 kJ/mol, and the standard enthalpy of formation of ClO_2(g) is Delta H_f degree = 102.5kJ/mol, use Hess's law to calculate the value for the enthalpy of formation per mole of ClO(g). Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

1/2 Cl2 + O2 ----> ClO2

clo2 ----> clo. + O.

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1/2Cl2 + O ----> ClO   dHf0 = (243+102.5) = 345.5 kj/mol

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