JEE Main 2014 Chemistry question
The standard enthalpy of formation for methane, is −74.9 kJ . In order to calculate the average energy given out in the formation of a C − H bond from this it is necessary to know which one of the following?
Answer: (3)
Solution
The formation enthalpy refers to , but a bond energy is defined from gaseous atoms. To convert, the carbon must be atomised (enthalpy of
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