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  4. The enthalpy change in the reaction 2CO+O2arrow 2CO2 is termed as

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Q. The enthalpy change in the reaction $ 2CO+O_{2}\rightarrow 2CO_{2} $ is termed as

Chhattisgarh PMTChhattisgarh PMT 2010

Solution:

Since the given reaction is a balanced chemical reaction, the enthalpy change occurring during the reaction is called enthalpy of reaction $ (\Delta _{r}H) $ . (Remember, here the enthalpy change cannot be said enthalpy of combustion because two moles of $ CO $ are used while heat of combustion is the heat liberated when one mole of a substance undergoes combustion in excess of oxygen.)