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[" 46.If at "298K" the bond energies of ...

[" 46.If at "298K" the bond energies of "C-H,C-C" ,"],[C=C" and "H-H" bonds are respectively "414,347,],[615" and "435k/mol^(-1)" ,the value of enthalpy "],[" change for the reaction "],[H_(f)C=CH_(2)(g)+H_(2)(g)rarr H_(3)C-CH_(3)(g)" at "298K" will "],[[" be "],[" (A) "+250kJ],[" (C) "+125kJ]]

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