One quantum is absorbed per molecule of gaseous iodine for converting into iodine atoms. If light absorbed has wavelength of `5000A^(@)`, The energy required in `kJ mol^(-1)` is

Options

A. 139
B. 239
C. `23.9`
D. 60

Answer

B

Explanation

`E = N_(0)hv = (N_(0)hc)/(lambda)`
`=(6.02 xx 10^(23) xx 6.626 xx 10^(-34) xx 3xx 10^(8))/(5000 xx 10^(-10)) = 239.3 kJ mol^(-1)`