Question

What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?

Answer 1

`h=6.626`x`10^(-34) J.s`
`c=3`x`10^8` `ms^-1`
`λ=486`x`10^-9` `m`
1 mol photons = `6.023`x`10^23` photon

Energy of one photon (`E`) = (`6.626`x`10^(-34) J.s` x `3`x`10^8` `ms^-1`)/(`486`x`10^-9` `m`)

Energy of one mole photon (`E`) = (`6.023`x`10^23` x`6.626`x`10^(-34) J.s` x `3`x`10^8` `ms^-1`)/(`486`x`10^-9` `m`)

Energy of one mole photon (`E`) =`2.46`x`10^5` `J`