energy of one mol of photons whose frequency is `5xx10^(14)Hz` is approximately equal to :
A
`199kJ mol^(-1)`
B
`174 kJ mol^(-1)`
C
`150 kJ mol^(-1)`
D
`300 kJ mol^(-1)`
Text Solution
Verified by Experts
The correct Answer is:
A
energy of one mol of photons ………… Energy (E ) of one photon is given by the expression `E = hv` `h =6.626xx10^(-34)Js` `v = 5xx10^(14)s^(-1)` (given) `E = (6.62xx10^(-34)Js)xx(5xx10^(14)s^(-1))` `= 3.31xx10^(-19)J` Energy of one mole of photons `= (3.31xx10^(-19)J)xx(6.02xx10^(23)mol^(-1))` `= 199.2kJ mol^(-1)`
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