The average bond energy of CCI for polyvinyl chloride is 340

The average bond energy of C-CI for polyvinyl chloride is 340,000 J/mol. Can visible light (K = 4000-7000(lambda=4000~7000 A) have enough energy to break the bond? Recall E = hv, where h is Planck\'s constant and v is vibration frequency.

Solution

E = hc / lambda

    = 6.626 * 10^-34 * 3 * 10^8   / 4000 * 10^-10

    = 4.9696 * 10^-19   Joules

Bond Energy   = 340000 / 6.023 * 10^23    = 5.645 * 10^-19   Joules / bond

as Bond Energy is greater than available energy , the bond will not break.