bond of butane is composed of a degree rotation about the bond eliminates the bo

Question

bond of butane is composed of a degree rotation about the bond eliminates the bond krmed by re overlap of patlls and , a ben'omed bythe evedne·ips hybridetiahAw. broken. Thus, the 180-degree rolation that is required f go a geometric change depends on the abilty to break the bond. uman vision. Rotation bond, is required for Part B The average bond enthalpy for a CCdouble bond is 614 kJ/mol and that of a C-C single band is 348 k3/mol the bond ofthe double bond of 2-butene. Esimate the energy noeded to break only Express your answer numerically in joules per molecule Hints 4.42*10-19 J/molecule My Answers Give Up Correct Part C what is the longest wavelength of light that wilprovide photons of sultcent energy to break the r bod ad ause he isomer to? Express your answer numerically in nanometers Hints nm 4.49 10 Submit My Answers Give Up CH Incorrect; Try Again; 3 attempts remaining tene acBook

Explanation / Answer

Part C

The energy of the bond is estimated to be 4.42*10-19 J/molecule. It is expected that a single photon will break the bond in a molecule. The wavelength of the incident photon is given by the relation

E = h*c/ where h = Planck’s constant = 6.626*10-34 J.s; c = speed of the photon = 3.0*108 m.s-1 and is the wavelength of the photon. Plug inn values and obtain

4.42*10-19 J = (6.626*10-34 J.s)*(3.0*108 m.s-1)/

=====> = (6.626*10-34 J.s)*(3.0*108 m.s-1)/(4.42*10-19 J) = 4.49728*10-7 m = (4.49728*10-7 m)*(1 nm/1.0*10-9 m) = 449.7285 nm 449.73 nm (1 m = 1.0*109 nm, ans).

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