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How do you measure the enthalpy of formation of carbon monoxide? |
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Answer» Solution :(i)Hess.s law can be applied to calculate the enthalpy of formation of carbon monoxide. It is very DIFFICULT to CONTROL the oxidation of graphite to give pure CO. However, enthalpy for the oxidation of graphite to `CO_2` can be easily measured and enthalpy of oxidation of CO to `CO_2` is also measurable. (ii)The APPLICATION of Hess.s law ENABLES us to estimate the enthalpy of formation of CO. `C+O_2 to CO_2 "" DeltaH^@` =-393.5 kJ ...(i) `CO+1//2O_2 to CO_2 "" DeltaH^@`=-283 kJ ...(ii) on inverting equation (2), we get `CO_2 to CO+1//2O_2 "" DeltaH^@`=+283 kJ ...(3) on ADDING equations (2) and (3) , we get `C+1//2 O_2to CO "" DeltaH^@`=-393.5 +283 =-110.5 kJ |
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