1.

The heat of atomisation of methane and ethene are 360 kJ/mol and 620 kJ/mol, respectively. The longest wavelenth of light capable of breaking the C-C bond is (Avogadro number =6.02xx10^(23),h=6.62xx10^(-34) Js)

Answer»

`2.48xx10^(3)NM`
`1.49xx10^(3)nm`
`2.49xx10^(5)nm`
`2.48xx10^(4)nm`

Solution :`4BE(C_H)` BOND =360kJ/mol
`BE(C-H)` bond =90kJ/mol
In `C_(2)H_(6)implies BE_((C-C))+6BE_((C-H))=620kJ//mol`
`BE_((C-C))` bond`=620-6xx90=80kJ//mol`
`lamda` for RUPTURE of `C-C` bond `=(6.262xx3xx10^(8))/(80xx10^(3))`
`=2.48475xx10^(4)nm`


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