energy of one mol of photons whose frequency is `5xx10^(14)Hz` is approximately equal to :

Explanation

Energy (E) of one photons
`E = hv`
`h = 6.626 xx 10^(-34) Js`
`v = 5 xx 10^(14)s^(-1)` (given)
`E (6.626 xx 10^(-34)Js) xx (5 xx 10^(14)s^(-1))`
`= 3.313 xx 10^(-19)J`
Energy of one moles of photons
`=(3.313 xx 10^(-19)J) xx (6.022 xx 10^(23)mol^(-1))`
`=199.51 kJ mol^(-1)`