Calculate the energy for one mole of photons (an einstein) for light absorbed at 7.00 × 102 nm.

Asked by maham237 @ 25/12/2020 in Chemistry viewed by 378 People

Answered by maham237 @ 25/12/2020

We know that:
f * λ = c
and
E = h*f
so,rearranging:

E/h = C/λ
given:
h = 6.90 × 10^2 nm

substituting the values:

E = C/λ x h
(c is the speed of light;that is 3x10^8 m/s)

= 3x10^8 x 6.626x10^-34 / 6.90 x10^7m x 6.022x10^23
Hence,
using calculator:
we get,
E = 1.69 x 10^5 Joules

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