By using photons of specific wavelengths, chemists can dissociate gaseous HI to

Question

By using photons of specific wavelengths, chemists can dissociate gaseous HI to produce H atoms with certain speeds. When HI dissociates, the H atoms move away rapidly, whereas the heavier 1 atoms move more slowly, (a) If a photon of 247 nm is used, what is the excess energy (in J) over that needed for dissociation? (b) If this excess energy is carried away by the H atom as kinetic energy, what is its speed (in m/s)? (Bond energy of H-I is 295 kJ/mol.) Enter your answers in scientific notation. |3.15 times 10 -19 J times 10 (select) m/s

Explanation / Answer

HI -----------> H' + I' (using radiation)

Energy = hc / wave length

=( 6.62x 10-34 x 3x108 ) / 247 x 10-9

= 8.04 x 10-19 J

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