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The enthaply of atomisation for the reac...

The enthaply of atomisation for the reaction : `CH_(4)(g) to C(g) + 4 H(g)` is `1665 kJ "mol"^(-1)`.What is the bond enthalpy of C-H bond? (Keep your answer in KJ/mol and three digits only)

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In `CH_(4)`, there are four `C - H` bonds. The enthalpy of atomisation of 1 mole of `CH_(4)` means dissociation of four moles of `C - H`bonds.
`:. C - H` bond energy per mol `= (1665 kJ)/(4 mol)`
`= 416.25 kJ mol^(-1)`
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Knowledge Check

  • The thermochemical equation CH_4(g) to C(g) + 4H(g) ,Delta_(a) H^(Ɵ)=1665 KJ mol^(-1) is an example of -

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