Question

# Calculate energy of one mole of photons of radiation whose frequency is $$5 \times { 10 }^{ 14 }.$$

Solution

## The energy of one photon (E) $$=hv$$Here, $$h=6.626\times {10^{34}}$$ js $$v= 5\times 10^{14} s^{-1}$$$$E=6.626\times 10^{-34} \times 5\times 10^{14}$$$$3.313\times 10^{-19}$$ jThus the energy of one mole of photons is $$E\times A$$ Where A is the Avogadro number$$=3.313\times 10^{-19}j\times 6.022\times 10^{-23}$$ mol$$=199.50 \times 10^{-3}j mol$$Chemistry

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